Finding the Brightest Pixel in an Image

How do i select the brightest pixel in an image?

Set a threshold adjustment layer over your image. Drag the slider to the right until you see the last remaining white specks. These are where your brightest pixels are.

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Quickest way to find the darkest pixel in an image

I was wondering what the absolute fastest way to grab the darkest pixel(grayscale) in a picture. Or if anyone could give me any ideas on how one would go about making a fast dark pixel finder.

Is the image Greyscale or RGB?
Either way - you can access the data by getting the Raster
Raster r = image.getData()
Lookup the methods on Raster - you can access the data as one array.
If the image is RGB - you will have to convert it to a Greyscale value (you let the JVM do it by creating a new Greyscale image and drawing to it, or doing it yourself by access each one and performing the math)...
Lemme know...

Locating the position of the brightest pixel in a region of interest

I need to locate the x and y coordinates for the brightest pixel in a region of interest rectangle (user defined). I see that there's a Light Meter that uses a rectangle, but I can't find a way to have it tell me the location of the brightest pixel (only the intensity)
Any input would be appreciated. I'm using v7.1.
Thanks

I don't have time to try to come up with a solution that uses divide and find. Divide in for sections, find the brightest one, then divide that one into four sections. Keep going until you get your answer.
If you use IMAQ Light Meter (Line) you can find the pixel using the line profile.
Matthew Fitzsimons
Certified LabVIEW Architect
LabVIEW 6.1 ... 2013, LVOOP, GOOP, TestStand, DAQ, and Vison

Finding the Darkest Pixel in a BufferedImage

What is the best way to find the darkest pixel in a BufferedImage?

What is the best way to find the darkest pixel in a
BufferedImage?Define 'darkest'.
The simplest way to do it would be for each pixel to get the red, green and blue parts and take the max of those values as its brightness.

Where can I find the scale value of mx:Image with scaleContent enabled?

Hey all
Like the topic says, where can I find the scale value of the image content using an mx:Image with scaleContent set to true. Both the scale on the image object and the image.content is 1 (resizing is probably done by a matrix).
To put things into context: I'm loading a picture from the filesystem and then use the Marilena facedetection to check for faces. When I find any faces I draw on a overlaying UIComponent the box where the face is. Because the detections returns the position of the face based on the unscaled bitmapdata the box indicating the face is not in the right position. In order to get this right I need the scale factor of the mx:Image scaleToFit.
tnx in advance!

Nope, there it is also 1.
I solved it by calculating it myself:
detectLayer.scaleX = detectLayer.scaleY = image.width>image.height?Bitmap(image.source).width/image.width:Bitmap(image.source).heig ht/image.height;

How can I find the file size of an image within an iPhoto event or album?

In order to see the file size of any particular photo, I've been dragging a copy onto my desktop and using "get info." Is there a better way?
I'm using 10.7.4 and iPhoto 11 v 9.3.2

1. That's only getting the file size of the Preview.
2. Click on a photo to select it. Then click on the info button. You can get the dimensions and the file size in the top of the pane
Note that the final size of any image will depend on the export settings you choose.

When attempting to Sign a pdf document I am not finding the option to use an image, I'm only able to use a digital signature. I want to use a jpg file.

I click on Fill & Sign Tools, then I click Place Signature. The instructions show a dialog box with four options however that does not happen. I am only presented with the option of importing a digital signature. How do I get to the option of importing an image (jpg) signature?
Robert

I assume you have a digital ID set up already. When you sign then you need to select how the signature is to appear and you can then select create new appearance. Not sure if this is what you are dealing withage.

Where can I find the file size of an image?

In PS CS4, when you hover the mouse over an image, one that I have that is sized as a 5x7 at 200 ppi, it shows 933 kb.
When I open the file, and look at the lower left of the screen, it shows a "Document Size" of 4.01 mb.
The correct size is 933kb, because it's from a D200 10MP Raw file, converted into jpg, then downsized to the 5x7 at 200 ppi. Default sizes are basically 13x19 at 200 pp (which shows up as a Document Size of 28.7 mb).
What is a "Document Size" (I think it's the actual dimension area, not pixel size), and why, when the image is open, can I not see the actual file size of 933k anywhere?

jeff bach wrote:
In PS CS4, when you hover the mouse over an image, one that I have that is sized as a 5x7 at 200 ppi, it shows 933 kb.
You mean in Windows Explorer window? Photoshop will not show you such information.
jeff bach wrote:
What is a "Document Size" (I think it's the actual dimension area, not pixel size),....
http://help.adobe.com/en_US/photoshop/cs/using/WSfd1234e1c4b69f30ea53e41001031ab64-7508a.h tml
.. can I not see the actual file size of 933k anywhere?
No you can not. You may plan to save it as jpg with any amount of compression that will greatly influenced the file size and Photoshop is not that much intelligent yet to guess your plans :-)

Where can I find the filename list for iOS image Default.png ?

I have a really hard time finding where information is scattered on Adobe. Does anyone know the definitive list of supported Default image filename for iOS publishing?
Here is what I was using previously to support up to iPhone5 in portrait orientation:
Default.png
[email protected]
[email protected]
Default-Portrait.png
[email protected]
I'd like to add iPhone 6 and 6+
thanks

Up until now, I would include these images for a landscape only app:
[email protected]
Default-Landscape.png
[email protected]
Default.png
[email protected]
The Default-Landscape.png would appear on non Retina iPad, and would be correct whichever way you held the device. Likewise [email protected] would do the same for Retina iPad.
According to your article, Default-Landscape@2x doesn't exist any more, and Default-Landscape is now specifically for Landscape Left.
Is this correct, or can we continue to only have Default-Landscape & Default-Landscape@2x?
My guess/hope is that the article is wrong, and that there is both a Default-Landscape@2x still, and a Default-LandscapeLeft, and that Default-Landscape is not specifically for Landscape Left.

How can I save the 12-bits gray scale image ?

Software & Hardware
NI-IMAQ Vision 6.0
NI-IMAQ for 1394 2.0.0
Hamamatsu C4742-95
I acqured the 12-bits gray scale image (Format7 , 640X512 size , 12bits) successfully.
And CWIMAQViewer display the correct image of which the range is from 0(black) to 4096(white).
But, I don't find the way to save this image with 12-bits format T.T
Always, CWIMAQVision object save this image to 8-bit format.
I tested all formats - tiff, bmp, aip, png.
I think there are two possible problems.
1. I dont't know the way to save the 12bits gray scale image. :{
2. I dont't know the way to read the 12bits gray scale image that saved correctly.
How can I save and load the 12-bits gray scale image ?
What is the solution for this problem T.T ?

Hello,
I would recommend taking a look at the "ReadImage" Visual Basic project for more information on setting the image type and saving the image to file. When you run the program, make sure you select 16 bit for your image. You can also add another button to this example for saving the image. Within the click subroutine for the button, you can add the line:
CWIMAQVision1.WritePNGFile CWIMAQViewer1.Image, "C://image.png"
This method will save the image in the viewer as a png file. As long as it was loaded as a 16 bit image, it should save all of the 12 bit information into the file. You could then test the new image by loading it using the example (you can see the pixel values by right-clicking on the viewer and selecting Settings>>Show Image Info. The pixel value displayed in the info bar corresponds to the mouse position.
Best Regards,
Jesse D.
Applications Engineering
National Instruments

Function that finds the absolute path of a file

Hi,
I'm creating an application using the SDL framework.
The following code gives me the absolute path for the file "caisse.jpg", which is located in my application bundle. Then, I can use the value of "cstrURL" to load the image with IMG_Load(cstrURL);
#import <CoreFoundation/CoreFoundation.h>
int main(int argc, char *argv[])
CFURLRef url = CFBundleCopyResourceURL( CFBundleGetMainBundle(),
CFSTR("caisse"),
CFSTR("jpg"), //extension du fichier
NULL );
const char* cstrURL = CFStringGetCStringPtr(
CFURLCopyFileSystemPath(url,kCFURLPOSIXPathStyle),
CFStringGetSystemEncoding()
printf("URL: %s", cstrURL);
return EXIT_SUCCESS;
But I have many files to load for my application. I tried to create a function that would take as parameter informations about the image, and then automatically find the absolute path of this image.
( void imgPath(char name[], char ext[], char destination[] ---> name = "image", ext = "jpg", destination is a variable in which the function puts the absolute path of the file)
How can I do that? What bugs me is the use of the CFSTR macro in the code I have...
Thank you very much
FRANKY

The CFSTR macro can only use a constant string as parameter, not a variable one.
You can use instead CFStringCreateWithCString if the parameter is a C String (char *).
Additionaly, I think the input parameters of your imgPath function must be of char* type, not char. And the output parameter char** (but it would be easier to know with the function source code).

How do i find out the dpi of a an image on my i mac

Can anyone please tell me how I find out the dpi of an image on my intel iMac?
I dont have Photshop. I just need to lnow what the dpi is and if its not the right size then maybe make it bigger (if thats possible)
Thanks,
P

If you are looking for a free alternative to Photoshop look at
Gimp
http://gimp.lisanet.de/Website/Download.html
You can't just resize an image using Preview.
Resizing an image will change its dimensions, but not the DPI/resolution.
Images on the Internet are usually at computer screen resolution of 72 DPI. Some images in the web might be at 150 DPI depending on the type of website it is.
Just resizing an image will make the image worst as you are only making the available pixels in the image larger and more spread out causing an even blurrier image.
You need an image editor that will increase the number of pixels in an image as you increase the size.
This is called interpolation. You are adding artificial pixels to an image to boost its DPI resolution.
These pixels are created from the surrounding existing pixels in an image.
Done correctly, you can get a pretty sharp image from a low DPI image.
Done incorrectly, you can make the image very ugly, blurry and look very out of focus.
You minimize this effect by increasing the DPI of an image in small increments. I use 50 DPI increments.
Some users use even smaller DPI increments like 25 DPI or smaller.
I have a certain amount of impatience, so I use a larger upscale amount. I still get pretty good results that are more than just acceptable. Some user are just more particular about how much detail and sharpness they want their final image to be. I feel increasing the resolution of an image to 300-350 DPI using 50 DPI increments is a good compromise. My own user preference.

How do I find the number of pixels in height of photos?

I have been asked the following question: If you wish to send book cover images the preferred format is .jpg, 648 pixels high, at a resolution of 100 dpi. Where do I find the answer?

Open the image in Preview .app and Get Info command i
To set the size and resolution in Preview:
Menu > Tools > Adjust Size…
Peter

How do I find the current browser window width in pixels?

I'm writing a PHP script that will use the current browser
window width
and height, but I don't know how to find that. Is there some
way to
capture the width and height of the current window in pixels?
TIA

Thanks Micha, you certainly may ask why.
I posted a message some time ago in the appdev forum about
the Recordset
Paging server behavior being geared toward use with tables. I
was
frustrated because I wanted to do something with repeated
div's in a
liquid site. But the Recordset Paging s.b. locks the number
of records
per page to a fixed number. I'm trying to figure out how to
make the
records per page a variable that's determined by the window
width. I've
created a liquid site with a products page that contains both
text and
thumbnail product images. The text occupies 2/3 of the width
of the
window, and the div container that holds the floated div
thumbnails I
want to account for the other third. The thumbnail div's are
produced by
a WHILE statement and I want them to be paged based on the
number of
div's that will fit within a container that occupies a
percent of the
browser window width. Here's what I've got so:
$window_size_wide = ; // Current browser window width in px
$window_size_tall = ; // Current browser window height in px
$thumb_cont_wide = $window_size_wide * .3; // 30% of window
width incl.
padding in px
$thumb_cont_tall = $window_size_tall * .4; // 40% of window
height incl.
padding in px
$thumb_size_wide = 100; // thumbnail div width incl. margins
in px
$thumb_size_tall = 100; // thumbnail div height incl. margins
in px
$no_thumbs_wide =
ceil(($thumb_cont_wide/$thumb_size_wide)-1);
$no_thumbs_tall =
ceil(($thumb_cont_tall/$thumb_size_tall)-1);
$records_per_page = ($no_thumbs_wide * $no_thumbs_tall);
$offset = ($thispage - 1) * $records_per_page;
$total_pages = ceil($total_records/$records_per_page);
etc.
What I don't know is how to find the current window width or
height. I
would also like to know if the $thumb_cont_wide and the
$thumb_cont_tall
can be determined in some way based on the div size generated
through my
CSS. In other words, I don't want to declare the percent of
height and
width in this script, I want to declare it only in my CSS and
have it
determined by the browser window width and height. The only
element I
want to hard code is the size of the thumbnails as they will
always be
the same. It seems to me that something like this could be
done to make
recordset paging scalable to match a scalable web page.
So the question is, can I define a PHP variable based on a
Javascript
variable? If so, how? If not, how can I accomplish this? Is
this just
not possible?
Thanks for your help.

Where do I find the image resolution in iPhoto '09

Where do I look in iPhoto '09 to find the resolution of a photo?

Are you referring to the "dpi" setting for the image? That's not relevant until you set a print size. DPI is dots per inch so you need to divide the width of the image in pixels (dots) by the width of the print (inches) to get the resolution of that print.
This will give you more info on that: The Myth of DPI.
Many cameras will set the dpi in the metadata at 180 dpi. iPhoto changes it to 72 dpi as that's generally the screen resolution of many monitors. But as described above it's meaningless until you go to print the image.
OT

Finding the Brightest Pixel in an Image

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