validate Retina image sizes (they have to be even in width & height and @1x has to be half sized of @2x version)

validateRetinaImages.py

import os, sys, glob

# logging methods
def printRed(msg):
    print "\x1B[" + "31;40m" + msg + "\x1B[0m"
def printGreen(msg):
    print "\x1B[" + "32;40m" + msg + "\x1B[0m"

# check for argument
if len(sys.argv) <= 1 :
    print "No directory name given."
    sys.exit()

# check if PIL is installed
try:
    from PIL import Image
except ImportError:
    printRed("ERROR: You have to install PIL (python image library) first!")
    sys.exit()

# read and print path
path = sys.argv[1]
wrongFiles = []

# define scan method
def scanDir(path, dirname='') :
    if not os.path.exists(path):
        return

    if len(dirname) == 0 :
        print "Scanning directory: \"" + os.path.basename(path) + "\""

    # read all @2x png files in path (not including subdirectories yet)
    listing = glob.glob( os.path.join(path, '*@2x.*'))

    # no png files found
    if len(listing) == 0 and len(dirname) == 0 :
        print ">> No @2x.png files found."
    elif len(listing) > 0 and len(dirname) > 0 :
        print "Scanning directory: \"" + os.path.basename(path.replace("/"+dirname,"")) + "/" + os.path.basename(path) + "\""
                        
    # iterate over png files
    filesOkayCount = 0
    for file in listing:
        basename = os.path.basename(file)
        baseWithDir = basename
        if len(dirname) > 0 :
            baseWithDir = dirname + '/' + basename

        # read 2x image
        image = Image.open(file)
        imageSizeString = str(image.size[0]) + "x" + str(image.size[1]) + "px"
        msg = basename + ", " + imageSizeString
        
        # read 1x image
        smallFile = file.replace("@2x", "");
        smallFileExisting = os.path.exists(smallFile);
        if smallFileExisting:
            smallImage = Image.open(smallFile)
            smallImageSizeString = str(smallImage.size[0]) + "x" + str(smallImage.size[1]) + "px"
            smallMsg = basename + " and " + basename.replace("@2x", "") + " are not half/double size of each other " + imageSizeString + " vs " + smallImageSizeString
        else :
            smallMsg = basename.replace("@2x", "") + " (non retina) image missing"

        # check size
        if image.size[0]%2 != 0 or image.size[1]%2 != 0 :
            wrongFiles.append(baseWithDir)
            printRed("ERROR " + msg)
        # compare size
        elif not smallFileExisting or smallImage.size[0] != image.size[0]/2 or smallImage.size[1] != image.size[1]/2 :
            wrongFiles.append(baseWithDir)
            printRed("ERROR " + smallMsg)
        else :
            # printGreen("OK " + msg)
            filesOkayCount += 1
    
    if filesOkayCount > 0 :
        printGreen("OK " + str(filesOkayCount) + " correct files")

    if len(listing) > 0 :
        print " "

    # scan subdirectories
    for file, dirs, other in os.walk(path) :
        for dir in dirs :
            scanDir(path+"/"+dir, os.path.basename(dir))


# start scanning
scanDir(path)

# print total results
print "Results:"
if len(wrongFiles) > 0 :
    printRed(str(len(wrongFiles)) + " wrong file(s):")
    print '\n'.join(['x ' + str(file) for file in wrongFiles])
else :
    printGreen("\nAll files OK.")

Max: und cool wäre es natürlich, wenn es gleich noch schauen würde, ob es auch zur nicht-Retina-Version passt.

Jetzt wird auch geprüft ob die Höhe/Breite im 1x genau die Hälfte von 2x ist!