PercepTool is a Photoshop plugin that mimics what the brain “sees” upon looking at a photo, which isn’t exactly how a camera records it: “PercepTool takes the image made in the digital camera sensor (also called luminance image) and changes it into what our brain actually perceives. The luminance image consists of 2 sub (intrinsic) images: reflection and illumination. The reflection and illumination images are separated from the luminance image in the visual cortex of the brain, processed and recombined into what is known as the percept, or the image that we actually perceive. We call this image luminosity. Most of the changes are due to differential recombination of the edges in the image and optimization of tonal values.”
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