Every color,
measured.
The color tools of a pro image editor — picker, channels, Lab, gamuts, harmonies — with every formula shown and checked. CIELAB, OKLCH, CIEDE2000 and APCA, verified against reference implementations.
Tools
Color Picker→
HSB, RGB and Lab channel modes, gamut and web-safe warnings, swatches.
Converter→
14 formats from HEX to OKLCH, with every step of the math shown.
Harmony Wheel→
Complementary to tetradic on RGB, RYB or OKLCH wheels. Exports tints & shades.
Palettes→
195 palettes with a lab report: text contrast, color blindness and print.
3D Color Spaces→
The same gamut as cube, cone, bicone, Lab and OKLab solids.
Lab Matrix→
a*b* slices and hue leaves through CIELAB and OKLab, sRGB or P3.
Chromaticity→
CIE xy and u′v′ with spectral & Planckian loci and six gamuts.
Sky Lab→
Sunrise and sunset colors from physics, as gradients and palettes.
Contrast & ΔE→
WCAG 2.2, APCA and four ΔE formulas — with an auto-fix.
Gamma Explorer→
Content made for one gamma, shown at another: curves, ramps and images.
Gradients→
One gradient, nine interpolation spaces, lightness curves and CSS.
Image Lab→
OKLab palette extraction, histograms, loupe and CVD simulation.
Print Preview→
Two CMYK profiles side by side on real paper: gamut, ink and black checks.
Color Compare→
ΔE between CMYK through any profile, Lab, PANTONE or your library, split into L, C and h.
CxF Viewer→
Spectral curves, Lab under any light and M0 / M1 / M2 from your CxF files.
Learn
Why do three numbers describe every color you can see? Why is a 50%-lightness yellow so much brighter than a 50%-lightness blue? Why do gradients go grey in the middle? The theory guide answers with live diagrams instead of hand-waving.