Tintmatch

Rules

Tintmatch measures your colour memory. A colour fills the screen for 3 seconds, then vanishes: make it again with three sliders, hue, saturation and lightness, the preview following live. Submit, and both colours show side by side with your mark for the round, from 0 to 10. After 5 colours, the smallest total difference wins; on a tie, the fastest.

• The difference is measured in ΔE CIEDE2000, the formula of printers and painters: around 1, two colours side by side can barely be told apart; beyond 10, nobody would mix them up.
• Daily challenge: the same colours for everyone, renewed at midnight (Paris time). Only your first run is ranked; the next ones are practice.
• Free run: new colours every game, your best run of the day counts.
• Leaving or reloading the page during a colour counts its full difference.
• With the keyboard: Tab goes from one slider to the next, the arrows move by 1, and by 10 with Shift, Enter submits.
• Colour blind? You can play: the difference also counts saturation and lightness, not just hue. Some hues, often reds and greens, will cost you more points: compare yourself mostly with yourself.