RGB vs. HSL Colors
Understanding RGB and HSL color models and when to use each in CSS and design.
A
RGB (Red, Green, Blue)
Pros
- ✓ Maps directly to how screens work
- ✓ Universally understood
- ✓ Supported everywhere
- ✓ Easy to convert from HEX
Cons
- ✗ Hard to intuit what a color looks like from the values
- ✗ Difficult to adjust brightness/saturation by hand
- ✗ Not perceptually uniform
BEST FOR
Working with screen colors directly, converting from HEX, using color values from design tools, pixel manipulation
B
HSL (Hue, Saturation, Lightness)
Pros
- ✓ Intuitive — "rotate the hue by 30 degrees" makes sense
- ✓ Easy to create color variations (just change L)
- ✓ Great for design systems and theming
- ✓ CSS functions like color-mix() work well with HSL
Cons
- ✗ Requires conversion to render
- ✗ Not all design tools output HSL natively
- ✗ Perceptual uniformity is better with OKLCH
BEST FOR
CSS variables for themes, generating tints/shades, hover/active state variations, programmatic color manipulation
Verdict
Use RGB/HEX for exact colors from designs. Use HSL in CSS for building design systems, creating color variants, and theming — it's much easier to reason about "10% lighter" in HSL than in RGB.
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