LearningRevealsv2

Surrounding colour changes perceived colour

Two identical greys look different once their backgrounds change.

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Output
Shared surround #9A9088
Sample #808080
Sample #808080
Same #808080. The darker surround makes that grey look lighter.
Input
Light surround #E8DFD0
Dark surround #1A1410
Sample #808080
Sample #808080
Relationship

What connects the input and output?

The visual system evaluates local contrast rather than reading each sample in isolation. Change the surrounds or the shared sample with the colour pickers.

Sources

2
  1. Britannica: ColorEncyclopaedia Britannica
  2. NASA Science: Visible LightNASA ScienceUS-PUBLIC-DOMAIN

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