🎨 Color Mixer

$ man colors

Drag the three sliders — hue (which color), saturation (how strong) and lightness (how light) — until your mix melts into the target, then lock it in. No numbers until you commit: this is an eye drill. The ± buttons step by exactly 1 — hold one down and it runs, the same way holding an arrow key on a focused slider does. On a phone that is how you land an exact hue: the track only has room for about 2° a pixel there, so the last few degrees belong to the buttons.

Scored by ΔE — how far apart your eye reads the two colors. Under 2 you cannot tell them apart, and that scores a full 100. The window scales with the target, so being 10° off costs about the same on a vivid color as on a grey one; what changes across the round is how hard the target is to read. Five colors per round: an easy warm-up, then vivid, then muted, ending near-grey — the hardest to judge. After the fifth, a recap lines up all five pairs.

Studio tip: get the lightness right first (half-shut your eyes until the colors drop away), then which color it is, then how strong. Most mixes fail on lightness, not hue.