There are always discrepancies between a model and reality, but these models are refined and improved as research progresses. That is, attempts to describe reality and not the reality itself. The XYZ space represents what happens in the retina, and Lab represents what subsequently happens in the brain, but both color spaces are Lab space is derived from CIE XYZ space, which represents the physiological response of 3 of the 4 types of photo-sensitive cells in the retina (the cones). Lab space aims to decouple the brightness information (L channel) from the chroma information (channels a and b) and takes into account the non-linear corrections that the human brain makes to the linear signal it receives from the retina. The color space CIE Lab was published in 1976 by the International Commission on Illumination (CIE), in an attempt to mathematically describe the color perception of the average human being. You don’t need to understand it in detail in order to understand what happens next. This article begins with a 3 section introduction of the Lab space. Why is that? What does it involve? How does the use of darktable change? Answers here… Original post in French by Aurélien PIERRE, edited by the pixls community.ĭarktable is slowly converging to a scene-referred RGB workflow.

Darktable 3.0 font