Color Theory, HSL Conversions & WCAG Accessibility Standards

Designers and frontend engineers work with multiple color spaces daily. Understanding color theory and Web Content Accessibility Guidelines (WCAG) ensures UI layouts look great and remain accessible to visually impaired users.

Understanding Color Spaces

• HEX & RGB: Additive light model used by computer displays (Red, Green, Blue).
• HSL: Intuitively separates Hue (0–360° color wheel angle), Saturation (0–100% color purity), and Lightness (0–100% brightness).
• CMYK: Subtractive ink model used for physical paper printing (Cyan, Magenta, Yellow, Key/Black).

WCAG Contrast Ratios

WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text. Level AAA requires 7:1 for normal text.

Pick and convert colors using our interactive Advanced Color Picker, calculate contrast ratios with the Color Contrast Checker, or translate color codes with the HEX to RGB Converter.