Sort Images by average luminance -- possible? Hints?
Another edition of "Not that I know of". :-)
Is there any way to sort Images in Aperture by average luminance?
Is there any way to determine the average luminance and save this to a custom metadata field?
Bonus: hue?
NB: using the Preview to determine average luminance or hue is OK by me .
Thanks in advance.
--Kirby.
Frank Caggiano wrote:
Looks like with the current tools in Aperture there is no way to do this. You might want to look and see if there is any third party apps but I'm not hopeful.
I haven't found anything. There is the app I mentioned in the similar thread in the OS X Dev forum: CF/X Photo Mosaic. It (surprisingly quickly!) creates a database of the images that will be used as tesserae in the making of photo mosaic, and allows the user to sort the image database by average color or average luminance. I've asked their input. There is no way to export the database, or — afaict — to use any of the information outside the program itself.
Here's a screengrab from the manual showing images in the Photo Mosaic database with each image's average hue and average luminance displayed as a sample tile and a hex ordinal. The luminance scale is 1 to 256 (in hex). I'm not sure what the hue scale is (I guess it's 16 million).
Frank Caggiano wrote:
One of the new systems strengths is reported to be the ability to write extensions for the core image engine more easily then the current state of writing a plugin for Aperture. Perhaps something will get written then.
We'll see. I am holding my breath.
Not .
Similar Messages
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Sort image files by average luminance and by average hue?
Hi. I would like to be able to sort images by average luminance and by average hue. Is there anything in OS X that will let me determine the average luminance or average hue of an image, and save that datum to the image?
Ultimately, I would like to use this within Aperture (my sole area of expertise {all my ASC points are from the Aperture forum}). After I posted the question there, a regular suggested I post in this forum to find out what is possible: specifically, are there any AppleScript hooks that might allow this? (Sadly, I don't script, but it helps me know what can be done.)
I know of one program which does this: CF/X's Photo Mosaic, which uses the averages to match an image to a tile in the "master image". I don't know of any way to attach the Photo-Mosaic-generated averages to the files themselves. I asked CF/X about this today.
Thanks.Hello
You may try the AppleScript script listed below. It is a simple wrapper of rubycocoa script which uses CIFilter to calculate average brightness and hue of each image (jpg|jpeg|png) in specified directory tree. It is a skeleton just to generate a TSV output of [brightness, hue, file] records sorted by brightness and then hue on desktop. I don't know how to embed these info into image metabata.
Script is briefly tested under 10.6.8.
Hope this may help somehow,
H
PS. If copied code has extra spaces in front of every line, which appears to be the case with some browsers including Firefox, please remove them before running the script.
-- SCRIPT
set d to (choose folder with prompt "Choose start folder")
set args to d's POSIX path's quoted form
do shell script "/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby -w <<'EOF' - " & args & " > ~/desktop/test_out.txt
# get average brightness and hue of image files (jpg|jpeg|png)
# * output record = B=brightness [TAB] H=hue [TAB] file [LF]
# * sorted by brightness and then hue
require 'osx/cocoa'
include OSX
EXTS = %w[ jpg jpeg png ] # target extensions
module OSX
class << CIContext
def contextWithSize(w, h)
br = NSBitmapImageRep.alloc.objc_send(
:initWithBitmapDataPlanes, nil,
:pixelsWide, w,
:pixelsHigh, h,
:bitsPerSample, 8,
:samplesPerPixel, 4,
:hasAlpha, true,
:isPlanar, false,
:colorSpaceName, NSCalibratedRGBColorSpace,
:bytesPerRow, 0,
:bitsPerPixel, 0)
c = NSGraphicsContext.graphicsContextWithBitmapImageRep(br)
CIContext.objc_send(:contextWithCGContext, c.graphicsPort , :options, {})
end
end
class CIFilter
def setParameters(dict)
self.setValuesForKeysWithDictionary(dict)
end
def output
self.valueForKey('outputImage')
end
end
class << CIVector
def vectorWithRect(r)
self.vectorWithX_Y_Z_W(r.origin.x, r.origin.y, r.size.width, r.size.height)
end
end
end
# process ARGV and retrieve image files with given extensions under specfied directory
raise ArgumentError, %Q[Usage: #{File.basename($0)} directory] unless ARGV.length == 1
dir, = ARGV.map { |a| a == '/' ? a : a.chomp('/')}
ff = %x[find -E \"#{dir}\" -type f -iregex '.*/.*\\.(#{EXTS.join('|')})$' -print0].split(/\\0/)
# get CIContext and CIFilter
cic = CIContext.contextWithSize(5000, 5000) # let it be large enough
cif = CIFilter.filterWithName('CIAreaAverage')
cif.setDefaults
# retrieve average brightness and hue of images
hh = {}
ff.each do |f|
u = NSURL.fileURLWithPath(f)
ci = CIImage.imageWithContentsOfURL(u)
civ = CIVector.vectorWithRect(ci.extent)
cif.setParameters({'inputImage' => ci, 'inputExtent' => civ})
ciout = cif.output
cgout = cic.objc_send(:createCGImage, ciout, :fromRect, ciout.extent)
colr = NSBitmapImageRep.alloc.initWithCGImage(cgout).colorAtX_y(0, 0)
hh[f] = { :b => colr.brightnessComponent, :h => colr.hueComponent}
end
# sort criteria
brightness = lambda { |k| hh[k][:b] }
hue = lambda { |k| hh[k][:h] }
brightness_and_hue = lambda { |k| b, h = hh[k].values_at(:b, :h); b * 1e6 + h }
# print sorted records
hh.keys.sort_by(&brightness_and_hue).each do |k|
b, h = hh[k].values_at(:b, :h)
puts %Q[B=%f\\tH=%f\\t%s] % [b, h, k]
end
EOF"
-- END OF SCRIPT -
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Go to Solution.Dear Logan,
This error occurs in the saving process (before the build is complete). In the details section says:
Visit the Request Support page at ni.com/ask to learn more about resolving this problem. Use the following information as a reference:
Error 6 occurred at AB_Source_VI.lvclass:Close_Reference.vi -> AB_Build.lvclass:Copy_Files.vi -> AB_Application.lvclass:Copy_Files.vi -> AB_EXE.lvclass:Copy_Files.vi -> AB_Build.lvclass:Build.vi -> AB_Application.lvclass:Build.vi -> AB_EXE.lvclass:Build.vi -> AB_Engine_Build.vi -> AB_Build_Invoke.vi -> AB_Build_Invoke.vi.ProxyCaller
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=========================
NI-488: I/O operation aborted.
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