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.