How to Convert HWB to OKLCH
Converting HWB to OKLCH upgrades your color from a legacy sRGB model to a modern, perceptually uniform color space. Both formats use a cylindrical model, but OKLCH is built on advanced math that makes it significantly more reliable for web design.
Why OKLCH is the Modern Standard
While HWB is intuitive for mixing paint, it has several drawbacks for digital design that OKLCH solves:
- Perceptual Accuracy: In HWB, lightness is relative to the hue. A yellow with 10% black is much brighter than a blue with 10% black. In OKLCH, lightness is absolute. If two colors have an OKLCH lightness of
0.65, they will look equally bright to the human eye. - Stable Gradients: HWB gradients often suffer from unexpected color shifts (like blue turning purple as it fades to white). OKLCH gradients remain perfectly smooth and hue-stable.
- Wide Gamut Support: HWB is locked to the sRGB color space. OKLCH can describe any color the human eye can see, allowing you to utilize the vibrant colors available on modern P3 displays.
The Conversion Pipeline
To convert HWB to OKLCH, the color must pass through a mathematical pipeline. The HWB values are converted to RGB, linearized, and transformed into the OKLab color space using LMS cone response matrices. Finally, the a and b coordinates of OKLab are converted into Chroma and Hue using trigonometry, resulting in the final OKLCH values.