Adding either a colorized grid or horizontal lines causes the brain to see a grayscale image as a colored one. This is known as the Munker illusion.

@yogthos what? that's so cool!
I would like to see the original images to see whether my brain came up with the right colors.

@gattogateaux I imagine averaging out colors is probably a core part of the visual system. But could be an effect similar to color blindness for example.

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