Discussion
Spatial additive mixing occurs when
Answer: A
Correct answer: small coloured elements are too fine to resolve individually
When the elements fall below the eye’s resolving power their light is integrated on the retina and adds, so the effect is additive even though the elements are printed inks. Halftone printing, a display’s subpixels and pointillist painting all work this way, and all three revert to visible separate colours at close range.
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