How Color blindness simulator works
Color blindness simulator applies a scientifically derived color transformation to an image to show how it appears to people with protanopia (red-blind), deuteranopia (green-blind), tritanopia (blue-blind) or achromatopsia (no color perception). Designers use it to audit charts, maps, infographics and UI screenshots for accessibility before publishing.
Unlike Color palette (which extracts dominant colors) and Color scheme (which generates palettes), this tool transforms an entire image to simulate a different perceptual experience. It uses established linear-algebra colour matrices from peer-reviewed models, a close perceptual approximation rather than a medical diagnostic, accurate enough to catch problematic colour combinations.