OKLCH vs. HSL: Understanding the Shift
Converting OKLCH to HSL moves a color from an absolute, perceptually uniform space into a relative, mathematically flawed cylinder. You can use the converter above to get the exact HSL values, but you will likely notice a significant shift in the numbers—especially the lightness percentage.
Perceptual vs. Relative Lightness
The biggest difference between these two formats is how they handle lightness. In OKLCH, the L channel is absolute. A lightness of 0.5 is exactly halfway between black and white as perceived by the human eye, regardless of the hue.
In HSL, lightness is relative to the hue. A pure yellow and a pure blue can both have an HSL lightness of 50%, even though the yellow appears much brighter. When converting from OKLCH to HSL, the lightness percentage changes drastically to accommodate the flaws in the HSL color model.
The Conversion Process
There is no direct path between OKLCH and HSL. The conversion requires translating the OKLCH color into OKLab, then to linear RGB, applying gamma correction to get standard sRGB, and finally calculating the Hue, Saturation, and Lightness from those RGB channels.