You know the spot the difference puzzles. Is there a app that can do that automatically?
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Do you just want different pixels flagged, or do you want software that lets you define what counts as a difference? What price? What input formats? Any output required, or display-only? Please edit your question.– user416Oct 15, 2015 at 14:49
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1 Answer
There is an example of using python to do this visually for you here but to reproduce it:
- Done on windows - Yes but could be on any of a number of platforms
- Free
The code:
from PIL import Image
from PIL import ImageChops
a = Image.open("pict1.jpg")
b = Image.open("pict2.jpg")
diff = ImageChops.difference (a, b)
RED = ('red')
RL = Image.new('RGB', diff.size, RED) # Make a red layer the same size
RedDiff = ImageChops.multiply(RL, diff)
Result = ImageChops.blend(RedDiff, b, 0.7)
Result.show()
Example:
Inputs: 
Output:
answered Oct 15, 2015 at 16:57
