RGB and HSL are two ways of writing the same set of screen colors. Neither is more accurate — they simply organize color differently, and that difference matters when you edit colors by hand.
RGB: how screens make color
RGB mixes red, green and blue light. Each channel goes from 0 to 255. rgb(255, 127, 80) is Coral . RGB maps directly to how displays work, which is why HEX codes are just RGB in base 16.
The problem: if you want a slightly darker coral, which numbers do you change? Lowering all three channels evenly works roughly, but it also shifts saturation in ways that are hard to predict.
HSL: how people describe color
HSL stands for hue, saturation and lightness:
- Hue is the position on the color wheel, from 0° to 360° (0° red, 120° green, 240° blue).
- Saturation is how intense the color is, from 0% (gray) to 100%.
- Lightness runs from 0% (black) through 50% (pure color) to 100% (white).
The same coral in HSL is hsl(16, 100%, 66%). To darken it, lower only the lightness: hsl(16, 100%, 50%). To make a muted version, lower the saturation.
Side-by-side comparison
| Task | RGB | HSL |
|---|---|---|
| Copying from design tools | Excellent | Good |
| Making lighter or darker variants | Awkward | Easy |
| Building harmonies (rotating hue) | Hard | Easy |
| Image processing and math | Natural | Requires conversion |
A limitation of HSL
HSL lightness is not perceptual. hsl(60, 100%, 50%) (yellow) looks far brighter than hsl(240, 100%, 50%) (blue), even though both have 50% lightness. For perceptually even scales, modern CSS offers oklch(), and our shades generator shows how different steps compare.
Practical recommendation
- Store brand colors as HEX for compatibility.
- Use HSL (or OKLCH) when you need to generate variants in code or CSS.
- Convert freely with the RGB to HSL converter — the colors are identical, only the notation changes.
