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Mechanics & PhysicsChromologium · Praxologium

APCA Perceptual Contrast

Etymology: Advanced Perceptual Contrast Algorithm (Somers, 2022)
PRIMARY DEFINITION

A modern perceptual luminance contrast model factoring human cone adaptation, spatial frequency, and text weight.

Relational Analysis & Epistemic Context

Replaces legacy flat WCAG 2 contrast ratios with power-law equations accurately modeling human visual acuity limits.