Björn Ottosson proposed OKlch in 2020 to create a color space that can closely mimic how color is perceived by the human eye, predicting perceived lightness, chroma, and hue.

The OK in OKLCH stands for Optimal Color.

• L: Lightness (the perceived brightness of the color)
• C: Chroma (the intensity or saturation of the color)
• H: Hue (the actual color, such as red, blue, green, etc.)

Also read:

Answering the question that is often asked, “Do I need to use ACEScg to display an sRGB monitor in the end?” (Demonstration shown at an in-house seminar)
Comparison of scanlineRender output with extreme color lights on color charts with sRGB/ACREScg in color – OCIO -working space in Nuke

Download the Nuke script:

https://www.designmantic.com/blog/infographics/the-10-commandments-of-color-theory/