---
id: gh-better-colors
name: "better-colors"
url: https://skills.yangsir.net/skill/gh-better-colors
author: jakubkrehel
domain: ai-frontend-engineering
tags: ["oklch", "color-conversion", "palette-generation", "contrast-checking", "tailwind"]
install_count: 29000
rating: 4.60 (120 reviews)
github: https://github.com/jakubkrehel/skills/tree/main/skills/better-colors
---

# better-colors

> 该技能帮助前端开发者使用OKLCH颜色空间进行颜色转换、调色板生成、对比度检查和Tailwind v4主题集成。它将不直观的十六进制/RGB/HSL颜色转换为感知均匀的OKLCH值，自动处理色域边界、修复色调漂移，确保色彩在不同亮度下保持一致，提升可及性与设计质量。

**Stats**: 29,000 installs · 4.6/5 (120 reviews)

## Before / After 对比

### 颜色对比度调整效率

**Before**:

在没有此技能之前，开发者手动调整颜色对比度时需要反复尝试不同色值，每次修改后使用在线工具验证，平均耗时30分钟才能达到AA标准。

**After**:

此技能能够直接分析当前颜色对比度并给出建议的L值调整，开发者只需应用推荐值即可，整个过程缩短至2分钟。

| Metric | Before | After | Change |
|---|---|---|---|
| 对比度调整耗时 | 30分钟 | 2分钟 | -93% |

## Readme

# OKLCH Colors

OKLCH is a perceptually uniform color space where the numbers actually mean what you think they mean. Most color problems in CSS (broken palettes, failing contrast, hue drift) come from using color spaces that don't match how we see. OKLCH fixes the model so the tools work. To explore interactively, visit [oklch.fyi](https://oklch.fyi).

## Quick Reference

| Category | When to use | Reference |
| --- | --- | --- |
| Conversion | Hex/rgb/hsl to oklch | [color-conversion.md](color-conversion.md) |
| Palettes | Generate scales, multi-hue, dark mode | [palette-generation.md](palette-generation.md) |
| Contrast | APCA/WCAG checks, fixing failing contrast | [accessibility-contrast.md](accessibility-contrast.md) |
| Gamut & Tailwind | P3 fallbacks, `@theme` scales, gamut clamping | [gamut-and-tailwind.md](gamut-and-tailwind.md) |

## Why OKLCH

- **Perceptual uniformity.** Equal L steps = equal brightness. `oklch(0.5 ...)` is visually mid. HSL's `lightness: 50%` varies wildly by hue.
- **Stable hue.** HSL blue shifts toward purple as lightness changes. OKLCH hue stays constant across the full lightness range.
- **Independent chroma.** Chroma is an absolute measure of colorfulness that doesn't depend on lightness. HSL saturation does.
- **Finite gamut.** Not every oklch value maps to a displayable sRGB color. High-chroma values at certain hues will clip; gamut awareness is required.

## OKLCH Syntax

```
oklch(L C H)
oklch(L C H / alpha)
```

| Channel | Range | Description |
| --- | --- | --- |
| L (Lightness) | 0–1 | 0 = black, 1 = white. Perceptually uniform. |
| C (Chroma) | 0–~0.4 | Colorfulness. 0 = gray. Max depends on L and H. |
| H (Hue) | 0–360 | Hue angle in degrees. |
| alpha | 0–1 | Optional transparency. Slash syntax. |

```css
oklch(0.637 0.237 25.331)
oklch(0.8 0.05 200 / 0.5)
```

**Formatting:** L and C use 3 decimal places, H uses up to 3. Drop trailing zeros. Format `-0` as `0`. Browser support: Baseline 2023, 96%+ global coverage.

## Key Thresholds

| Rule | Value |
| --- | --- |
| Light/dark boundary | L > 0.6 = light background → use dark text |
| Lightness gap (light bg) | Foreground L < 0.35 when background L > 0.9 |
| Lightness gap (dark bg) | Foreground L > 0.9 when background L < 0.25 |
| Hue drift threshold | > 10° spread across palette steps = visible drift |
| APCA body text | \|Lc\| >= 75 minimum, >= 90 preferred |
| APCA non-body text | \|Lc\| >= 60 minimum |
| WCAG 2 normal text | 4.5:1 AA, 7:1 AAA |
| Contrast fix | Adjust L only; chroma has negligible effect |

## Review Output Format

Always present color changes as a markdown table with **Before** and **After** columns. Include **every color that was changed**, not just a subset. Never list findings as separate "Before:" / "After:" lines outside of a table.

| Before | After |
| --- | --- |
| `color: #3b82f6` | `color: oklch(0.623 0.188 259.815)` |
| Same absolute C across hues | Same C% of each hue's max chroma |
| No sRGB fallback for P3 color | `@media (color-gamut: p3)` wrapper |

This keeps feedback scannable and diff-friendly. Each row is a self-contained change the developer can act on independently.

## Common Mistakes

| Issue | Fix |
| --- | --- |
| Hex/rgb/hsl color in new code | Convert to `oklch()` |
| HSL palette ramp with hue drift | Rebuild with constant oklch hue |
| Failing contrast (check foreground vs its background using APCA) | Adjust oklch L channel, keep C and H |
| High chroma without gamut check | Clamp to max chroma for the L/H in sRGB |
| Same absolute C across different hues | Use same C% (percentage of max) for consistent vividness |
| P3 color without sRGB fallback | Add `@media (color-gamut: p3)` pattern |
| Dark mode with hand-picked colors | Derive from light palette by reversing L mapping |
| Hex in Tailwind v4 `@theme` | Convert to oklch values |
| Alpha with comma syntax | Use slash: `oklch(L C H / alpha)` |

## Reference Files

- [color-conversion.md](color-conversion.md): Supported formats, conversion examples, bulk conversion rules, what to leave alone
- [palette-generation.md](palette-generation.md): Scale convention, generation algorithm, multi-hue palettes, dark mode, why not HSL
- [accessibility-contrast.md](accessibility-contrast.md): APCA and WCAG 2 thresholds, fixing contrast with L, lightness gap guide, hue drift detection
- [gamut-and-tailwind.md](gamut-and-tailwind.md): sRGB vs P3, gamut clamping, CSS fallback patterns, Tailwind v4 @theme and migration


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*Source: https://skills.yangsir.net/skill/gh-better-colors*
*Markdown mirror: https://skills.yangsir.net/api/skill/gh-better-colors/markdown*