Ampandheaust
d4e8634f67
Amp-Thread-ID: https://ampcode.com/threads/T-019f9d91-77c1-7206-a60f-ed6554ce92ab Co-authored-by: Heaust Azure <heaust.azure@gmail.com>
23 lines
1.0 KiB
TypeScript
23 lines
1.0 KiB
TypeScript
import test from "node:test";
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import assert from "node:assert/strict";
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import { isInSrgbGamut, mapOklchToSrgb, maxSrgbChroma, oklabToOklch, srgbToOklab } from "@lib/color/oklab.js";
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test("Oklab conversion matches reference primaries", () => {
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const red = srgbToOklab([1, 0, 0]);
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assert.ok(Math.abs(red.l - 0.627955) < 1e-5);
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assert.ok(Math.abs(red.a - 0.224863) < 1e-5);
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assert.ok(Math.abs(red.b - 0.125846) < 1e-5);
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const white = srgbToOklab([1, 1, 1]);
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assert.ok(Math.abs(white.l - 1) < 1e-6);
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});
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test("Oklch gamut mapping preserves lightness and hue by reducing chroma", () => {
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const requested = { l: 0.65, c: 0.6, h: 1.2 },
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limit = maxSrgbChroma(requested.l, requested.h);
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assert.ok(limit < requested.c);
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assert.equal(isInSrgbGamut({ ...requested, c: limit }), true);
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const rgb = mapOklchToSrgb(requested);
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assert.ok(rgb.every((value) => value >= 0 && value <= 1));
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const mapped = oklabToOklch(srgbToOklab(rgb));
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assert.ok(Math.abs(mapped.l - requested.l) < 2e-5);
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assert.ok(Math.abs(mapped.h - requested.h) < 2e-4);
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});
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