RGB value from Camera
hello
I am new to iPhone Development. I am using UI ImagePickerView to Open Camera. I want to get RGB Color of Pixel from Camera.
Is there any Code of Sample App? Are there any suggested articles that I can read to learn more about my different options.
Please help, thanks!
vdave wrote:
I am new to iPhone Development.
So is pretty much everybody here. This is a technical support forum for users. As a developer, you have access to the developer forums, which is a far better place for your question.
Similar Messages
-
How to get RGB value from pixel of an image.
hi, i need a little help... Is there any EASY way to get RGB value from point of an image? I searched javadoc but i only found very complex getRGB method working only with regions, and saving data into arrays.
Is there any other way that can use for example image.getGraphics() (so, i mean to get RGB from point of Graphics object) ?
Btw.: If you know, how Sprite.collidesWith(Sprite s, Boolean pixellevel) is working (with pixellevel = true), please write me. It could solve my problem too.
ThanksIs there any other way that can use for example image.getGraphics() (so, i mean to get RGB from point of Graphics object) ?You can think of the graphics object like a pencil or paintbrush. Does a paintbrush know the color of the surface it is painting on? No.
Btw.: If you know, how Sprite.collidesWith(Sprite s, Boolean pixellevel) is working (with pixellevel = true), please write me. It could solve my problem too.Download the reference implementation from this site and see for yourself.
luck, db -
Hello ,
i am trying to get RGB value from vision,
but i don't know how to start with it.
thank you very much for helping me
Shingduplicate post
-
How to Get RGB Values from a CMYK Color in the DOM (CS5)
(CS5, Actionscript)
Hi all,
I have an InDesign document containing TextFrames whose border colors are specified as a CMYK array.
I would like to be able to get its color specification as its closest RGB equivalent.
Does the InDesign DOM contain a method for doing this for me automatically? If not, what workarounds are there?
TIA,
mlavieHere's how to convert RGB to CMYK:
function rgb2CMYK (r,g,b){
var color = app.documents[0].colors.add({space:ColorSpace.RGB,colorValue:[r,g,b]});
color.space = ColorSpace.CMYK;
var retVal = color.colorValue;
color.remove();
return retVal;
The same idea for the reverse.
For info on converting to grayscale, check out this:
http://in-tools.com/article/scripts-blog/convert-colors-to-grayscal-in-indesign/
HTH,
Harbs -
Getting rgb values from BufferedImage
BufferedImage.getRGB(int x, int y) returns the colour of an image pixel as an integer. My problem is that i need the seperate red/blue/green components of this. Does anyone know how I can get these?
Thanks.I've done that before but cant actually remember howe to go about it ... but here is an idea that should work
Color TEMP = new Color(BufferedImage.getRGB(int x, int y)) ;
Now to extract each component just use the methods getRed() getGreen() and getBlue() on TEMP.
Does it make sence to you?
If it does work let me know, just out of curiosity!
Rui -
Using the histogram and RGB values in camera raw
This question was posted in response to the following article: http://help.adobe.com/en_US/photoshopelements/using/WS287f927bd30d4b1f5548d97812e28a69a90- 7ff4.html
K so no one has been able to help me. When I open a raw image all my highlighted areas are pink. I cannot turn it off by clicking the little triangle. I'm losing my mind. I've been trying to figure this out for months!
-
Browse, open a Picture from phone. Getting the RGB value
Hai, can someone give me an example how to browse a picture file from the phone. And also an example on how to get the RGB value from a cordinate in a picture?
thx in advanced
ChapuiApple needs an "unsubscribe" option from iMessage, so you can cease to take part of the conversation, just like you would with notifications in a forum. This happens all the time with my family, a group text gets sent out, and you're stuck for hours hearing the beeps of messages getting sent back & forth. If not unsubscribed, just silence it so you still get a record of it, but you stop being notified every time a message shows up from that thread for a certain "period", say like 6 hours (in case anyone reuses the thread to send another group message later).
-
RGB values of current terminal color settings?
The colors displayed for different ANSI escape codes are configurable via .Xdefaults or directly on the command line via other ANSI escapes.
Is there any way to dump the current values from a terminal? For example, given the ANSI escape code "\033[31m", I would like to know the current RGB values used to display it.
Obviously this will depend on the terminal (e.g. urxvt can have different settings from xterm), but I'm hoping that there is some obscure tool to do this.Coincidentally, I recently wrote a script to do exactly this: query all the color values from a terminal emulator and show them in a nice table. I was planning to make a thread for this, but this thread is perfect. In my opinion, the strategy of querying colors from the terminal itself is superior (when it is supported by the terminal) to mucking around with .Xresources, .Xdefaults, or "xrdb --query", which only work in pretty limited situations. The drawbacks of my approach are: (1) it can be challenging to make the same code work on different terminal emulators, and (2) you have to use it from the terminal you want to query, and not from within a screen or tmux session. (I think there may be partial workarounds for (2), but I haven't implemented them.) I've tested my code on a number of terminals, and the upshot is that xterm and urxvt are supported flawlessly, and VTE-based terminals like gnome-terminal and XFCE's "Terminal" are almost fully supported. (I wasn't able to query the default foreground and background colors, but everything else seems to work.) Most other X terminals don't seem to support this method of querying color values.
Here's an example of what the script produces:
Obviously, that's a heavily formatted table, but I think the code has enough comments that you can take what you need from it. It works under python 3 or python 2.7.
Edit: This version is superseded by the one in post #27, which is structured better. I'm leaving this here since some of the future replies refer to it.
#!/usr/bin/python
This is a Python script to show off your terminal ANSI colors (or more
colors, if your terminal has them). It works on both Python 2.7 and
Python 3.
This script must be run from the terminal whose colors you want to
showcase. Not all terminal types are supported (see below). At the
very minimum, 16-color support is required.
Fully supported terminals:
xterm
urxvt
For these terminals, this script can show a color table with correct RGB
values for each color. It queries the RGB values from the terminal
itself, so it works even if you change the colors after starting the
terminal.
Mostly supported terminals: pretty much all VTE-based terminals. This
includes:
vte
Terminal (XFCE)
gnome-terminal
terminator
tilda
and many more. These are on "mostly" status because I don't know how to
query their foreground and background colors. Everything else works,
though, albeit with noticeable slowness (which may be beyond this
script's control).
Somewhat supported terminals: pretty much all other X-client terminals
I've tried. These include:
konsole (KDE)
terminology (Enlightenment)
Eterm (Enlightenment)
(etc.)
For these terminals, the script can output a color table just fine, but
without RGB values.
Unsupported terminals:
ajaxterm
Linux virtual console (i.e., basic TTY without X-windows)
Warning: do not run this script on the Linux virtual console unless you
want a garbled TTY! That said, you can still type `tput reset<Enter>'
afterward to get back to a usable console. :-) The situation with
ajaxterm is similar, but not as bad.
If a terminal isn't mentioned here, I probably haven't tried it. Attempt
at your own risk!
Note regarding screen/tmux: this script can theoretically be run from a
screen or tmux session, but you will not get any RGB values in the
output (indeed, a screen session can be opened on multiple terminals
simultaneously, so there typically isn't a well defined color value for
a given index). However, it's interesting to observe that screen and
tmux emulate a 256 color terminal independently of the terminal(s)
to which they are attached, which is very apparent if you run the script
with 256-color output on a screen session attached to a terminal with 8-
or 16-color terminfo (or with $TERM set to such).
This code is licensed under the terms of the GNU General Public License:
http://www.gnu.org/licenses/gpl-3.0.html
and with absolutely no warranty. All use is strictly at your own risk.
from sys import stdin, stdout, stderr
import re
import select
import termios
from collections import defaultdict
from argparse import (ArgumentParser, ArgumentError)
# Operating system command
osc = "\033]"
# String terminator
# ("\033\\" is another option, but "\007" seems to be understood by
# more terminals. Terminology, for example, doesn't seem to like
# "\033\\".)
st = "\007"
# Control sequence introducer
csi = "\033["
# ANSI SGR0
reset = csi + 'm'
# Errors that may be raised by rgb_query
num_errors = 0
class InvalidResponseError(Exception):
The terminal's response couldn't be parsed.
def __init__(self, q, r):
global num_errors
num_errors += 1
Exception.__init__(self, "Couldn't parse response " + repr(r) +
" to query " + repr(q))
class NoResponseError(Exception):
The terminal didn't respond, or we were too impatient.
def __init__(self, q):
global num_errors
num_errors += 1
Exception.__init__(self, "Timeout on query " + repr(q))
# Wrappers for xterm & urxvt operating system controls.
# These codes are all common to xterm and urxvt. Their responses aren't
# always in the same format (xterm generally being more consistent), but
# the regular expression used to parse the responses is general enough
# to work for both.
# Note: none of these functions is remotely thread-safe.
def get_fg(timeout):
Get the terminal's foreground (text) color as a 6-digit
hexadecimal string.
return rgb_query([10], timeout)
def get_bg(timeout):
Get the terminal's background color as a 6-digit hexadecimal
string.
return rgb_query([11], timeout)
def get_color(a, timeout):
Get color a as a 6-digit hexadecimal string.
return rgb_query([4, a], timeout)
def test_fg(timeout):
Return True if the terminal responds to the "get foreground" query
within the time limit and False otherwise.
return test_rgb_query([10], timeout)
def test_bg(timeout):
Return True if the terminal responds to the "get background" query
within the time limit and False otherwise.
return test_rgb_query([11], timeout)
def test_color(timeout):
Return True if the terminal responds to the "get color 0" query
within the time limit and False otherwise.
return test_rgb_query([4, 0], timeout)
def test_rgb_query(q, timeout):
Determine if the terminal supports query q.
Arguments: `q' and `timeout' have the same interpretation as in
rgb_query().
Return: True if the terminal gives a valid response within the
time limit and False otherwise.
This function will not raise InvalidResponseError or
NoResponseError, but any other errors raised by rgb_query will
be propagated.
try:
rgb_query(q, timeout)
return True
except (InvalidResponseError, NoResponseError):
return False
# String to use for color values that couldn't be determined
rgb_placeholder = '??????'
# This is what we expect the terminal's response to a query for a color
# to look like. If we didn't care about urxvt, we could get away with a
# simpler implementation here, since xterm and vte seem to give pretty
# consistent and systematic responses. But I actually use urxvt most of
# the time, so....
ndec = "[0-9]+"
nhex = "[0-9a-fA-F]+"
crgb = ("\033\\]({ndec};)+rgba?:" +
"({nhex})/({nhex})/({nhex})(/({nhex}))?").format(**vars())
re_response = re.compile(crgb)
# The problem I'm attempting to work around with this complicated
# implementation is that if you supply a terminal with a query that it
# does not recognize or does not have a good response to, it will simply
# not respond *at all* rather than signaling the error in any way.
# Moreover, there is a large variation in how long terminals take to
# respond to valid queries, so it's difficult to know whether the
# terminal has decided not to respond at all or it needs more time.
# This is why rgb_query has a user-settable timeout.
P = select.poll()
P.register(stdin.fileno(), select.POLLIN)
def flush_input():
Discard any input that can be read at this moment.
repeat = True
while repeat:
evs = P.poll(0)
if len(evs) > 0:
stdin.read()
repeat = True
else:
repeat = False
def rgb_query(q, timeout=-1):
Query a color-valued terminal parameter.
Arguments:
q: The query code as a sequence of nonnegative integers, i.e.,
[q0, q1, ...] if the escape sequence in pseudo-Python is
"\033]{q0};{q1};...;?\007"
timeout: how long to wait for a response. (negative means
wait indefinitely if necessary)
Return: the color value as a 6-digit hexadecimal string.
Errors:
NoResponseError will be raised if the query times out.
InvalidResponseError will be raised if the terminal's
response can't be parsed.
See
http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
("Operating System Controls") to see the various queries
supported by xterm. Urxvt supports some, but not all, of them,
and has a number of its own (see man -s7 urxvt).
Warning: before calling this function, make sure the terminal is
in noncanonical, non-blocking mode.
query = osc + ';'.join([str(k) for k in q]) + ';?' + st
flush_input()
stdout.write(query)
stdout.flush()
# This is addmittedly flawed, since it assumes the entire response
# will appear in one shot. It seems to work in practice, though.
evs = P.poll(timeout)
if len(evs) == 0:
raise NoResponseError(query)
r = stdin.read()
m = re_response.search(r)
if not m:
raise InvalidResponseError(query, r)
# (possibly overkill, since I've never seen anything but 4-digit RGB
# components in responses from terminals, in which case `nd' is 4
# and `u' is 0xffff, and the following can be simplified as well
# (and parse_component can be eliminated))
nd = len(m.group(2))
u = int('f'*nd, 16)
# An "rgba"-type reply (for urxvt) is apparently actually
# rgba:{alpha}/{alpha * red}/{alpha * green}/{alpha * blue}
# I opt to extract the actual RGB values by eliminating alpha. (In
# other words, the alpha value is discarded completely in the
# reported color value, which is a compromise I make in order to get
# an intuitive and compact output.)
if m.group(5):
# There is an alpha component
alpha = float(int(m.group(2), 16))/u
idx = [3, 4, 6]
else:
# There is no alpha component
alpha = 1.0
idx = [2, 3, 4]
c_fmt = '%0' + ('%d' % nd) + 'x'
components = [int(m.group(i), 16) for i in idx]
t = tuple(parse_component(c_fmt % (c/alpha)) for c in components)
return "%02X%02X%02X" % t
def parse_component(s):
Take a string representation of a hexadecimal integer and transorm
the two most significant digits into an actual integer (or double
the string if it has only one character).
n = len(s)
if n == 1:
s += s
elif n > 2:
s = s[:2]
return int(s, 16)
def test_num_colors(timeout):
Attempt to determine the number of colors we are able to query from
the terminal. timeout is measured in milliseconds and has the same
interpretation as in rgb_query. A larger timeout is safer but will
cause this function to take proportionally more time.
if not test_color(timeout):
return 0
a = 0
b = 1
while test_rgb_query([4, b], timeout):
a = b
b += b
while b - a > 1:
c = (a + b)>>1
if test_rgb_query([4, c], timeout):
a = c
else:
b = c
return b
class ColorDisplay(object):
Class for producing a colored display of terminal RGB values.
def __init__(self, timeout=100, color_level=3, do_query=True):
timeout: same interpretation as in rgb_query. A larger timeout
will be used a small number of times to test the
capabilities of the terminal.
color_level: how much color should be in the output. Use 0 to
suppress all color and 3 or greater for maximum coloredness.
do_query: whether to attempt to query RGB values from the
terminal or just use placeholders everywhere
self.timeout=timeout
self.color_level=color_level
# try getting the rgb value for color 0 to decide whether to
# bother trying to query any more colors.
self.do_query = do_query and test_color(self.timeout*5)
def none_factory():
return None
# colors for highlighting
self.hi = defaultdict(none_factory)
self.hi['['] = 10
self.hi[']'] = 10
self.hi['+'] = 9
self.hi['/'] = 9
for c in '0123456789ABCDEF':
self.hi[c] = 12
def show_ansi(self):
Show the 16 ANSI colors (colors 0-15).
color_order = [0, 1, 3, 2, 6, 4, 5, 7]
names = [' Black ', ' Red ', ' Green ', ' Yellow ',
' Blue ', ' Magenta', ' Cyan ', ' White ']
stdout.write(self.fgcolor('15', 3))
for k in range(8):
a = color_order[k]
stdout.write(names[a])
stdout.write('\n')
stdout.write(self.fgcolor(None, 3))
c = None
for k in range(8):
a = color_order[k]
c = self.hiprint(' [%X/%X] ' % (a, 8 + a), c)
stdout.write('\n')
self.show_color_table([0,8], color_order)
def show_color_cube(self, n):
Show the "RGB cube" (xterm colors 16-231 (256-color) or 16-79
(88-color)). The cube has sides of length 6 or 4 (for 256-color
or 88-color, respectively).
base = {256:6, 88:4}[n]
c = None
c = self.hiprint('[ + ] ', c)
for w in range(base):
c = self.hiprint('[%X] ' % w, c)
stdout.write('\n\n' + self.fgcolor(None, 3))
for u in range(base):
for v in range(base):
stdout.write(' '*v)
x = (u*base + v)*base
self.hiprint(' [%02X] ' % (16 + x))
for w in range(base):
self.show_color(x + w + 16)
stdout.write('\n')
stdout.write('\n\n')
def show_grayscale_ramp(self, end):
Show the "grayscale ramp" (xterm colors 232-255 (256-color) or
80-87 (88-color)).
start = {256:232, 88:80}[end]
n = end - start
vals = [self.get_color(a) for a in range(start, end)]
#stdout.write(reset)
c = None
c = self.hiprint('[ ', c)
for v in range(n):
c = self.hiprint('%02X ' % (start + v), c)
c = self.hiprint(']\n', c)
stdout.write('\n ' + self.fgcolor(None, 3))
for v in range(n):
stdout.write(' ' + self.block(start + v, 2))
stdout.write('\n ')
for u in range(3):
for v in range(n):
stdout.write(' ')
stdout.write(self.fgcolor(start + v, 2))
stdout.write(vals[v][2*u : 2*(u + 1)])
stdout.write(self.fgcolor(None, 2))
stdout.write('\n ')
stdout.write('\n')
def show_colors(self, n):
Make a table showing colors 0 through n-1.
self.show_color_table(range(0,n,8), range(8), n, True)
def show_color_table(self, rows, cols, stop=-1, label=False):
Make a color table with all possible color indices of the form
rows[k] + cols[j] that are less than `stop' (if `stop' is not
negative). If label is True, then print row and column labels.
if label:
self.hiprint('[ + ]')
stdout.write(self.fgcolor(None, 3))
for a in cols:
stdout.write(' ' + self.octal(a) + ' ')
stdout.write('\n')
if label:
stdout.write(' ')
stdout.write('\n')
for b in rows:
if label:
stdout.write(self.octal(b) + ' ')
for a in cols:
c = a + b
if stop < 0 or c < stop:
self.show_color(b + a)
else:
stdout.write(' ')
stdout.write('\n')
stdout.write('\n')
def show_color(self, a):
Make a pretty display of color number `a', showing a block of
that color followed by the 6-character hexadecimal code for the
color.
stdout.write(' ' + self.block(a) + ' ')
stdout.write(self.fgcolor(a, 2) + (self.get_color(a)))
stdout.write(self.fgcolor(None, 2))
def hiprint(self, s, last_color=-1):
Print s to stdout, highlighting digits, brackets, etc. if the
color level allows it.
Arguments:
s: the string to print.
last_color: the current terminal foreground color. This
should be `None' if no color is set, or the current
color index, or something else (like a negative integer)
if the color isn't known. (The last option is always
safe and will force this function to do the right
thing.)
Return: the current foreground color, which can be passed as
last_color to the next call if the color isn't changed in
between.
for c in s:
if c == ' ':
color = last_color
else:
color = self.hi[c]
if color != last_color:
stdout.write(self.fgcolor(color, 3))
stdout.write(c)
last_color = color
return last_color
def octal(self, x):
Return a base-8 string for the integer x, highlighted if the
color level allows it.
return self.fgcolor(self.hi['+'], 3) + '0' + \
self.fgcolor(self.hi['0'], 3) + ('%03o' % x)
def block(self, c, n=1):
Return a string that prints as a block of color `c' and size `n'.
return self.bgcolor(c, 1) + ' '*n + self.bgcolor(None, 1)
# Changing the foreground and background colors.
# While the 38;5 and 48;5 SGR codes are less portable than the usual
# 30-37 and 40-47, these codes seem to be fairly widely implemented (on
# X-windows terminals, screen, and tmux) and support the whole color
# range, as opposed to just colors 0-8. They also make it very easy to
# set the background to a given color without needing to mess around
# with bold or reverse video (which are hardly portable themselves).
# This is useful even for the 16 ANSI colors.
def fgcolor(self, a=None, level=-1):
Return a string designed to set the foreground color to `a' when
printed to the terminal. None means default.
if self.color_level >= level:
if a is None:
return csi + '39m'
else:
return csi + '38;5;' + str(a) + 'm'
else:
return ''
def bgcolor(self, a=None, level=-1):
Return a string designed to set the background color to `a' when
printed to the terminal. None means default.
if self.color_level >= level:
if a is None:
return csi + '49m'
else:
return csi + '48;5;' + str(a) + 'm'
else:
return ''
def get_color(self, a):
if self.do_query:
try:
return get_color(a, timeout=self.timeout)
except (InvalidResponseError, NoResponseError):
return rgb_placeholder
else:
return rgb_placeholder
# Command-line arguments
timeout_dft = 200
parser = ArgumentParser(
description="Python script to show off terminal colors.",
epilog="Run this script from the terminal whose colors " +
"you want to showcase. " +
"For a brief synopsis of which terminal types are " +
"supported, see the top of the source code.")
mode_group = parser.add_mutually_exclusive_group()
p_choices = [16, 88, 256]
arg_p = mode_group.add_argument(
'-p', '--pretty',
action='store_true', default=False,
help="show colors 0 through N-1 in a pretty format. " +
("N must belong to %r. " % p_choices) +
"If N > 16, it should be the actual number of colors " +
"supported by the terminal, or the output will almost " +
"certainly not be pretty.")
mode_group.add_argument(
'-f', '--flat',
action='store_true', default=False,
help="show a simple table with colors 0 through N-1. ")
parser.add_argument(
'n', nargs='?', metavar='N',
type=int, default=16,
help="number of colors to show. " +
"Unless you explicitly supply -p/--pretty or -f/--flat, " +
"--pretty is used if possible and --flat is used " +
"otherwise. " +
"N defaults to 16, showing the ANSI colors 0-15. " +
"If N is 0, the script will attempt to determine the " +
"maximum number of colors automatically " +
"(which may be slow).")
parser.add_argument(
'--no-fgbg',
action='store_false', dest='fgbg', default=True,
help="suppress display of foreground/background colors.")
parser.add_argument(
'--no-query',
action='store_false', dest='do_query', default=True,
help="don't try to query any RGB values from the terminal " +
"and just use placeholders.")
parser.add_argument(
'-t', '--timeout', metavar='T',
type=int, default=timeout_dft,
help="how long to wait for the terminal to "
"respond to a query, in milliseconds " +
"[default: {0}]. ".format(timeout_dft) +
"If your output has '?' characters " +
"instead of RGB values " +
"or junk printed after the script runs, " +
"increasing this value may or may not " +
"help, depending on the terminal. " +
"A negative T will behave like infinity.")
parser.add_argument(
'-l', '--level', metavar='L',
type=int, default=3,
help="choose how much color to use in the output. " +
"(0 = no color; 3 = most color [default])")
if __name__ == '__main__':
args = parser.parse_args()
assert not (args.pretty and args.flat)
if args.pretty:
if args.n not in p_choices:
raise ArgumentError(
arg_p,
"N must belong to %r" % p_choices)
tc_save = None
try:
tc_save = termios.tcgetattr(stdout.fileno())
tc = termios.tcgetattr(stdout.fileno())
# Don't echo the terminal's responses
tc[3] &= ~termios.ECHO
# Noncanonical mode (i.e., disable buffering on the terminal
# level)
tc[3] &= ~termios.ICANON
# Make input non-blocking
tc[6][termios.VMIN] = 0
tc[6][termios.VTIME] = 0
termios.tcsetattr(stdout.fileno(), termios.TCSANOW, tc)
if args.n == 0:
args.n = test_num_colors(args.timeout)
# We are guaranteed to have failed some queries now, but
# that isn't meaningful.
num_errors = 0
if not (args.pretty or args.flat):
if args.n in p_choices:
args.pretty = True
else:
args.flat = True
if args.level >= 1:
stdout.write(reset)
if args.fgbg:
if args.do_query:
try:
bg = get_bg(timeout=args.timeout)
except (InvalidResponseError, NoResponseError):
bg = rgb_placeholder
try:
fg = get_fg(timeout=args.timeout)
except (InvalidResponseError, NoResponseError):
fg = rgb_placeholder
else:
bg = rgb_placeholder
fg = rgb_placeholder
stdout.write("\n Background: %s\n" % bg)
stdout.write(" Foreground: %s\n\n" % fg)
C = ColorDisplay(args.timeout, args.level, args.do_query)
if args.pretty:
assert args.n in p_choices
stdout.write('\n ANSI colors:\n\n')
C.show_ansi()
if args.n > 16:
stdout.write('\n RGB cube:\n\n')
C.show_color_cube(args.n)
stdout.write(' Grayscale ramp:\n\n')
C.show_grayscale_ramp(args.n)
else:
C.show_colors(args.n)
if num_errors > 0:
stderr.write("Warning: not all queries succeeded\n" +
"Warning: (output contains " +
"placeholders and may be inaccurate)\n")
finally:
if args.level >= 1:
stdout.write(reset)
flush_input()
if tc_save != None:
termios.tcsetattr(stdout.fileno(),
termios.TCSANOW, tc_save)
Run it as
python showcolors.py -h
to get an overview of the functionality.
TL;DR: you can echo a string like "\033]4;13;?\007" to an xterm, and it will output the RGB value of color #13 to itself in the form "\033]4;13;rgb:rrrr/gggg/bbbb\007", which you can then read and parse. To try it out:
$ echo -en "\033]4;13;?\007"
There are some subtleties if you want this to work on other terminals like urxvt; for that you can experiment yourself or read the code.
Further reading: http://invisible-island.net/xterm/ctlseqs/ctlseqs.html (heading "Operating System Controls").
Xyne, regarding determining the number of colors: I don't know how to do that completely reliably. You can try simply
tput colors
but this relies on the value of $TERM and its terminfo and thus may be unreliable. A kludgy but workable way to do this using the "rgb_query" function in my script is to query color values using binary search to find the highest color value the terminal will allow you to query. The main problem with this is that if you query an invalid color index, then the terminal just won't respond at all, and if you query a valid index, it will respond but after a somewhat unpredictable delay, so it's hard to know for sure which one is the case. Like I said, it's kludgy but workable.
Edit: I went ahead and added that functionality to my script. Try running it as
python showcolors.py 0
or look at the function "test_num_colors".
Last edited by Lux Perpetua (2012-10-22 11:18:21) -
How Do I Applyi RGB Values ToTweak Colors
I have a selection or a layer of which I want to tweak the color. I use my color sampler to read the RGB values from my "source". How can I apply those values to my selection/layer ? If I use a color fill, I lose all detail in my original.
As always, thanks.
IraHere's an example.
I photograph a piece of painted wood straight on.
I then photograph it at a 45% angle.
I want the color of the wood to match, but not lose any texture or detail.
I can use my color sampler to read the RGB values of the straight on shot.
How can I use those values to tweak the RGB numbers in the angled shot?
If I add a color overlay of those numbers, its a solid fill and I lose the detail below.
Lowering the opacity of the overlay lets too much "under color" show through.
Is there a way to read the RGB values and adjust them "on the fly"? -
In LR 5.5 (same in previous versions) the RGB values in the histogram are shown in percent (relativ) values. I prefere to see the absolute values, but I can`t find any way to switch. Maybe this option is intentional disabled, because LR works in 16-Bit mode this would result in values up to 2^16. But as i compared the relativ values from LR with the absolute values from PS i run into a conversion problem. The following example shows the differences:
CameraRAW : RGB, 128,0,0
Lightroom: RGB, 43,8%, 19,0%, 6,2%
CameraRAW: RGB, 0,128,0
Lightroom: RGB, 29,8%, 47,5%, 17,5%
Mainly i have two questions:
1. Is there any possibility to change the percent RGB values in LR to absolut values?
2. How can i convert CameraRAW values to LR values (see above)?TThe reason that a design decision was made from the beginning of LR to show only the percentage values was that RGB values are dependent on the color space and the LR histogram and numerical readout are derived from the Develop module's display space which is a hybrid color space with ProPhoto RGB primaries and the sRGB TRC. Thus the numerical values in the display would be different from the exported RGB image (in an orthodox space) and it was feared that this would be misleading. When soft proofing was introduced, because it involved converting the display to an orthodox space, it became possible to use the 0-255 scale in that mode.
-
Legalities of color-and why are my RGB values inconsistent?
Hi there,
I have a client who is trying to trademark their logo and the RGB values. I have sent them the files and corresponding RGB values, but when they check the files in their mac Digital Color Meter they come up with different values. On my own computer, the values are consistent in the DCM and Photoshop, although I opened it on another computer and found that while the values were still correct when I open the files in Photoshop, the DCM values were incorrect there too.
Does anybody have any history with this? Should I just tell them to ignore their DCM and that Photoshop is correct, or am I doing something wrong with profiles or something? It wouldn't be such a big deal but for the legal implications behind it...
Thanks for any help!!
EliI was referring to "Scene Referred" CCchart Lab reference numbers derived from measurements taken of this chart from a spectrophotometer. You'll note the black patch is at L20 according to X-rite. The white patch is quite easy to attain L96 without clipping during exposure of the CCchart to build the profile from using DNG Profile Editor.
What's not easy to control during exposure is the contrast ratio recorded by the camera. Adjusting the middle slider in Levels or the Contrast slider in ACR will show just how much contrast affects hue and saturation viewed on a display. Reality doesn't behave this way.
Contrast/Luminance ratio's are disregarded or barely adjusted for in the DNG CCchart Wizard to come up with proper hue/saturation levels for each of the 18 color patches. The contrast adjusts required to get all 24 patches to match exactly (especially black at L20) makes the image not look right or follow a normal human visual response or perception.
You can adjust contrast in the image after applying the new profile to get a reasonably correct look but quite a few of the 24 patches go off the charts according to the X-rite reference Lab numbers. The whole reason for going by the Lab numbers in profiling a device like a DSLR in the first place is to maintain consistency image to image by using measured results. As you can see this is not possible to achieve in a photograph except maybe in a controlled studio environment, but it does work when trying to match single spot colors that aren't influenced by the surround effect that affects human perception inherent in a photographed scene. A pleasing photograph is not about accurate numbers.
A spectrophotometer is a static device that only reads and measures color wave lengths from color patches and converts them to Lab numbers. It's not a constantly adjusting device like our eyes which adapts to hue, saturation, color temp and contrast levels in any given scene.
I'm going to post three images of a CCchart exposed under a high noon sun that I used to build two different DNG profiles. The first is using ACR default DNG converted source image and doing a straight dual illuminant table profile according to instructions. They're screenshots that include Apple's DCM to show how the black patch changes to accommodate exact Lab numbers as opposed to achieving a pleasing look. You'll note the more the image is made to "pop" the less accurate the Lab readouts and appearance. -
Null Values from a Data Source
This is more of an implementation question than a
troubleshooting question. Also, since I've been unable to find any
documentation on this I was wondering if anyone has come across
this behavior or found a bug with it.
Yesterday I was working on an application to explore some
proof of concept aspects of Flex for an application I'm developing.
I started running into a problem with Flex Data Services throwing
back an 'Unknown Property: "clientaddress1"' error whenever I tried
to update data. It seemed that whenever I tried to update a record
in the database it would thrown the Unknown Property error. I spent
a good chunk of the day trying to figure out what was causing this
and finally gave up and called it a day.
This morning I was reassessing what the problem was and
trying to find the differences between my database and my code and
I stumbled upon the fact that I could add no records and modify
them without a problem, however if I tried to access an existing
record and update it I'd get the Unknown Property error.
I start analyzing the database and found that I'd configured
the database to use null values for empty values and the records
that I created with the database had null values, however, any of
the values inserted from Flex were inserted as blank values. As
matching my action script class as clientaddress1 = ""; So, upon
further testing I fould that Flex was not processing the null
values correctly, so that when it came back and rightly generated a
Conflict Error...and then called AcceptServer() it was unable to
find the clientaddress1 property of the class.
Also, if any of the properties in the database are null it
throws the same error. Basically it seems to have invalidated the
object just because one value was null. So if all of my values from
the DB are set to something and only one field is set to null it's
still throwing the error on the first alphabetical item of the
properties.
I can resolve the problem by not using null values in the
database, but...what sort of effect would this have on someone
working with a large legacy database that extensively uses nulls
for undefined values?
Also, if a Flex guru could explain the reasoning for this
happening I would greatly appreciate it!
Best regards,
Chris MaloneyI realize that I didn't clarify that I am using ColdFusion
for getting the data. This class was generated by the Create CFC
wizard in Flex Builder.
package com.generated
[Managed]
[RemoteClass(alias="components.generated.clients.Clients")]
public class Clients
public var clientid:Number = 0;
public var clientfirstname:String = "";
public var clientlastname:String = "";
public var clientaddress1:String = "";
public var clientaddress2:String = "";
public var clientcity:String = "";
public var clientstate:String = "";
public var clientzip:String = "";
public var clientphone:String = "";
public var clientemail:String = "";
public function Clients()
} -
Reading grayscale values from saved image
Hi,
I've written several methods that crop, convert to grayscale, histogram equalise and then resize a colour jpeg image for preparing sets of images for a face detection neural network. The next thing I want to do is to write a method that allows me to read that saved grayscale images pixel values back as singular grayscale values from the RGB values that were used to save the jpeg. I used this code to create the 2D array of grayscale pixel values
for (int i = 0; i < imageWidth; i++)
for (int j=0; j <imageHeight; j++)
grayRGB[i][j] = (rgb[i][j] & 0xff000000) | (eqGray[i][j]<<16) | (eqGray[i][j]<<8) | (eqGray[i][j]);
img.setRGB(i, j, grayRGB[i][j]);
}and then used this code to resize the image:
BufferedImage resized = new BufferedImage(20,20,1);
Graphics2D g = resized.createGraphics();
g.drawImage(img, 0, 0, 20, 20, null);
g.dispose();my class gets the RGB values on instantiation as follows:
//get RGB pixel values for image loaded
for (int i = 0; i < imageWidth; i++)
for (int j=0; j <imageHeight; j++)
rgb[i][j]= inputImage.getRGB(i,j);
//perform bitwise shift rgb information values to obtain appropriate values for each colour pixel
r[i][j]= (rgb[i][j] >> 16) &0xff;
g[i][j]= (rgb[i][j] >> 8) &0xff;
b[i][j]= (rgb[i][j]) &0xff;
}Is there a way to get the grayscale values directly from an image that is already converted to grayscale without having to perform the grayscale conversion method again, perhaps using a similar bitwise shift?
Thanks
Nickanswering this myself for those lost souls like i was a while ago:
the answer is very simple when you get to know it :) : use a signed type for your image. this can be achieved by using the Format Operator (javax.media.jai.operator.FormatDescriptor). an example as follows :
BufferedImage bufferedImage= someimage...
ParameterBlock pb = new ParameterBlock();
pb.addSource(bufferedImage);
pb.add(DataBuffer.TYPE_SHORT);
RenderedImage formattedImage =
JAI.create("format", pb, null);
// you may use as well TYPE_DOUBLE or TYPE_FLOATimage could be of any type such as PlanarImage, BufferedImage, RenderedImage etc..
then all you need to do is read your pixel values by using an iterator such as RectIter or RandomIter to access pixel values etc..
San -
Copy value from one field in subform, to another field in a different subform
Hi all. I have been back and forth with enterprise support, and they are telling me what I want to do is impossible. I find that hard to agree with, so hoping I can get some help here. I have a document that I am creating, based off an XML. The page consists of a header subform, a flowing table of variable name, and then a footer. My problem comes in, that when the table flows to mutliple pages, my header subform will not repeat, even though I have it set as the overflow header. According to Enterprise Support, this is by design. The header will repeat on the footer page, if that is on a separate page, just not when the table flows to another page. So, I came up with a solution to create an additional Header in my table, merge all the cells into one column, and copy my subform into that new header. I would set that header to appear only on subsequent pages. So, when I preview my document, it shows the static text fine, as I would expect, however the text fields are blank. I need a way of copying the values from the original header subform, into the newly created table header subform. The values will be different based on teh XML input, meaning that the first 3 pages will have one set of values, and the next 3 another, etc.. See sample below...
<NameValueList>
<NameValue>
<NameValueName>Name1<NameValueName>
<NameValueDesc>Desc1<NameValueDesc>
<TableValueList>
<TableValue>
Blah
</TableValue>
<TableValue>
Blah 2
</TableValue>
</TableValueList>
</NameValue>
<NameValue>
<NameValueName>Name2</NameValueName>
<NameValueDesc>Desc2<NameValueDesc>
<TableValueList>
<TableValue>
Blah 5
</TableValue>
<TableValue>
Blah 6
</TableValue>
</TableValueList>
</NameValue>
</NameValueList>
So, if I bind my original header to NameValueName, it will show on the first page which has my header, and the third page that has my footer. But my 2nd page, that has the table flowed to it, has a blank value. I tried to put code in the Initialize event of both text boxes, to copy from MainHeader.NameValueName to TableHeader.NameValueName, but that didn't work properly.
Any ideas on how to do this?Thank you very much for the reply. I tried putting the copy statement in both the MainHeader and TableHeader initialize events. There was different behavior, depending on the place I put the copy statement, however neither was correct. If I put it in the initialize of the TableHeader, the NameValueName that appears on other page is Name1. Even though the header shows Name2 when it hits the next nodes. If I put it in the initialize of MainHeader, nothing is copied on the proper table header pages.
I initially had Master pages, however that really didn't work. The master pages traversed the NameValueName nodes on it's own loop. So, Each page displayed the next value in it's own loop, when the main subform loop is still showing data from the previous value. I know this might be hard to understand, but I'm doing my best to explain. THanks again for your reply, and I hope that there is another idea out there to fix this... -
How to find the RGB Values of a Color for Hyperion
When customizing your Hyperion forms, we come across situations where we need the exact RGB value of a given color. This article explains a simple technique to find the RGB values using MS Paint and the Calculator applications that come as standard applications with your operating system.
Here are the steps to find the exact RGB value of a given color.
1) View your Hyperion form using IE, scroll down until you see the color you want to find the RGB value and press the "Print Screen" button (in your keyboard).
2) Open MS Paint and click Edit -> Paste or simply Ctrl+V. What you saw in the browser will be copied as a new untitled image.
3) Select the Color Picker tool and click on an area that has the color you want to match.
4) Now go to Edit Colors... option and click on the "Define Custom Colors >>" button. The color you picked will be selected on this palette. At the bottom right hand corner you will see the Red, Green and Blue values you need. Note down the R,G,B values (given in decimal).
5) Now we need to find out the hexa-decimal values that correspond to those decimal values. This is where we use the simple Calculator. Open the Calculator application from Program -> Accessories. Switch to the scientific mode by clicking View ->Scientific.
6) By default it will be in the decimal number mode. Enter the R value (238 in this example) and click on the Hex radio button. The corresponding hexa-decimal value (EE in this case) will be shown in the dial.
The selected color in this case has the same value for R, G and B. (In fact, all shades of gray has the same values for R, G and B.) Therefore, the RGB value of the background color that we need is #eeeeee. Repeat step 6 to find out the hex value for the Green and Blue elements, if they are different.
Tip:
If you find it difficult to pick a color, zoom the image by pressing Ctrl+PageDown or using View -> Zoom -> Custom... option.These tips are to find the RGB color of HFM default row where row is text and text lines in data columns are also visible to business users as Yellow as an input cell. By applying the same RGB color you can apply the same color to your data cells or rows. This post shows how to identify color from any web view-able object.
Regards,
Manaf
Maybe you are looking for
-
I had subscribed to the full CC program and then stopped it. Now i have an emergency need to just Photoshop 6 (is that also cc?). I learned on short notice that I will be teaching a Photoshop a full day this Thursday and need to plan today. Could som
-
Indesign CS3 Data Merge "Merge Records" Command. Help?
I'm looking to automate the merging of a mountain of records. I have 587 tab-delimited text files with 40 records each. I want to process these via Data Merge using a single pre-designed template with built-in placeholders and variable data fields, i
-
Tools to evaluate performance of adobe forms
Hi, I need some tool which will measure the performance of forms - time to load the form & time to load data in drop downs which are linked and dynamic and data for drop downs are getting fetched from database tables. Is there is any tool ava
-
the apps wont open but are fully updated in the creative cloud manager menu, how do I get them to open?
-
I want to set up my friends P3/550 MHz pc to dual boot Win98 and Arch Linux. How would I set it up so that he could read and compose the same email in both systems?