How the OKLCH to RGB Conversion Works
While the tool above handles the conversion instantly, the math behind translating OKLCH to RGB bridges the gap between human perception and digital hardware. OKLCH describes color using perceptual lightness and hue angles, while RGB dictates the exact intensity of red, green, and blue pixels on a screen.
Why Convert OKLCH to RGB?
OKLCH is the premier format for designing accessible, high-contrast color palettes and generating flawless CSS gradients. However, many older graphics libraries, canvas APIs, and legacy systems only accept RGB values. Converting your OKLCH colors ensures they render correctly across your entire technology stack.
The Mathematics of the Conversion
The conversion requires a multi-step pipeline. First, the OKLCH cylindrical coordinates are converted into OKLab Cartesian coordinates using basic sine and cosine functions.
Next, the OKLab coordinates are multiplied by an inverse matrix to convert them from LMS cone space back into linear RGB light. The sRGB gamma correction curve is then applied to the linear values, and the results are scaled to the standard 0-255 range used in CSS.
Handling Out-of-Gamut Colors
Because OKLCH can describe colors that exist in the real world but cannot be reproduced by standard monitors, the resulting RGB values may fall below 0 or above 255. In standard CSS, these out-of-bounds values are clamped to the nearest displayable color, which reduces the saturation of the original OKLCH value.