LCH to RGB Converter
Free, accurate, and instant conversion. Preview your color in real-time on digital and print mockups.
Source Input LCH
/* CSS Variable */ --color-primary: #000000; /* Standard */ color: #000000; background-color: #000000;
Implementing the Future: LCH to RGB
LCH is the future of web design. It allows you to specify colors that are perceptually uniform and potentially outside the standard monitor range (Wide Gamut).
However, purely relying on `lch()` in your CSS is risky for older devices. This tool lets you calculate the RGB Fallback so you can safely use modern colors while supporting everyone.
Display Safe
Ensure your colors degrade gracefully on non-HDR monitors.
CSS Fallback
Generate the code: color: rgb(...);color: lch(...);
Wide Gamut Maps
If a color is "too vivid," we intelligently map it to the closest safe sRGB equivalent.
The "Gamut Mapping" Challenge
Losing Vibrancy
LCH can describe colors (like a laser-bright cyan with Chroma=130) that literally cannot exist on a standard laptop screen. When you convert this to RGB, the tool has to "bring it in" to the maximum capabilities of the screen. This means the RGB result might look duller than the LCH concept. This is a physical limitation of the hardware, not a bug in the math.
Pro Tips for CSS Fallbacks
- • Progressive enhancement: Always put RGB fallback first, then LCH. Browsers use the last valid value.
- • Build-time conversion: Use PostCSS or Lightning CSS to auto-generate fallbacks.
- • Design tokens: Store colors as LCH in your system, compile to RGB for production.
- • Feature queries: Use @supports to provide enhanced experiences for modern browsers.
Who Uses LCH to RGB?
Progressive Enhancement Developers
Build modern experiences with graceful degradation.
Design Token Authors
Define colors in LCH, export to all formats.
CSS-in-JS Library Maintainers
Generate runtime fallbacks for color functions.
Cross-Browser Testing Engineers
Verify color rendering across browser versions.
Frequently Asked Questions
Why do I need to convert LCH to RGB?
While modern browsers support lch(), older browsers and many design tools do not. Converting to RGB allows you to provide a 'fallback' color so your site doesn't look broken on older devices.
What if my LCH color is outside RGB range?
LCH can define colors (like super-bright neon cyan) that standard RGB monitors cannot display. In this case, our tool performs 'Gamut Mapping' to find the closest possible specific RGB color, though it may look less vibrant.
How accurate is the conversion?
It is mathematically precise using the D65 white point, but due to gamut clipping, the visual result might differ if you are converting a wide-gamut LCH color to sRGB.
What is the syntax for LCH in CSS?
lch(Lightness% Chroma Hue). For example: lch(50% 100 180).
Is LCH the same as Lab?
LCH is a cylindrical representation of Lab. Lightness (L) is identical. Chroma (C) is the radius (distance from center). Hue (H) is the angle. It's just a different way of writing the same coordinates.
Why are the RGB numbers not integers?
The math produces decimals (e.g. 210.45). We round them to the nearest integer (0-255) for standard 8-bit CSS usage.
How do I use color-mix() with LCH?
CSS color-mix(in lch, blue, yellow) interpolates colors in LCH space, avoiding muddy greys. You can mix any color formats together.
Can I detect LCH support with @supports?
Yes! Use @supports (color: lch(50% 50 180)) to test for LCH support and apply progressive enhancement.
Does PostCSS support LCH conversion?
Yes! The postcss-preset-env plugin can transform LCH to RGB fallbacks at build time, adding browser support automatically.
How do I add alpha to LCH colors?
Use lch(50% 100 180 / 0.5) for 50% opacity. The alpha value uses the same slash syntax as modern rgb() and hsl().
What is relative color syntax in CSS?
Relative color lets you derive colors: lch(from var(--brand) l c calc(h + 30)) creates a hue-shifted variant. Powerful for theming.
Should I use OKLCH instead of LCH?
OKLCH has better hue linearity (blues don't shift purple). For new projects, OKLCH is recommended. Both use the same cylindrical model.