Long story short, I need to check an entire folder of images to see if they're grayscale. Here's a python script I just wrote that will do that, and output the results to a timestamped log file. I added some comments to explain how it works.

graycheck.py

from PIL import Image

import ImageChops

import os

import string

from time import strftime



def main():

    subdir = 'C:\\pathtoimages\\'

    diffdir = subdir + 'diff' # output directory if you want to save the results

    badFiles = []

    

    for subdir, dirs, files in os.walk(subdir):

        if subdir != diffdir: #only check the main dir

            for file in files:

                if string.upper(file[-3:])=="JPG": # jpegs only

                        im = Image.open(file)

                        imGray = im.convert("L") # convert the original jpeg to grayscale and keep a copy



                        # need to convert back to RGB, but only if the original file wasn't already in mode L

                        if im.mode == "RGB": 

                            imGray = imGray.convert("RGB")



                        # get the difference of the original image and the converted grayscale

                        # if the original was grayscale, there's no difference, so output will be entirely black

                        output = ImageChops.difference(imGray, im)



                        i = 0

                        

                        for color in list(output.getdata()):

                            if color != (0,0,0): # check RGB black and single black value

                                if color != 0:

                                    # Image is not grayscale, for we found a difference

                                    i=i+1

                                    print i, color

                                    break                

   

                        outputFile = diffdir + "\\" + file[:-4] + "_Diff.jpg" # output dir plus filename only plus an extension



                        if i==0: # image is all black, could not be blacker

                            badFiles.append(file)

                            # output.save(outputFile) # uncomment to save the results as an image - though it should be a solid black file



    # print badFiles # uncomment to see the results



    logfilename = strftime("%Y-%m-%d_%H-%M-%S") + ".txt"

    logfile = open(logfilename, "w")

    

    for badFile in badFiles:

        logfile.write(badFile + '\n')



    logfile.close()

                        

if _name_ == '_main_': 

     main() 

If you desire me to release this under a license, consider it released under the MS Public License.

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at


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midnight

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