if len(i1.getbands()) == 1
from PIL import Image, ImageChops, ImageDraw, ImageFont
def check_image_files(self, file1, file2, file3) :
''' Check two image files
``file1``: absolute path to the first file
``file2``: absolute path to the second file
``file3``: absolute path to the compare file
'''
self.builtin.log("File1: %s" %file1)
self.builtin.log("File2: %s" %file2)
point_table = ([0] + ([255] * 255))
f1 = Image.open(file1)
f2 = Image.open(file2)
diff = ImageChops.difference(f1, f2)
diff = diff.convert('L')
diff = diff.point(point_table)
f3 = diff.convert('RGB')
f3.paste(f2, mask=diff)
f3.save(file3)