CIELABCIEXYZ
CIELABCIEXYZ is a term used to describe the essential relationship between the CIELAB perceptual color space and the CIEXYZ linear tristimulus space. It is not a standalone, separate color space, but a label for the standard transformations that convert between L*, a*, b* values and X, Y, Z tristimulus values. These conversions are central to color management because CIELAB aims to be perceptually uniform, while CIEXYZ provides a device-independent reference tied to a defined white point.
CIELAB was defined by the CIE to approximate uniform color differences and to provide a device-independent
Forward and inverse transformations
From Lab to XYZ: given L*, a*, b*, and a reference white (Xn, Yn, Zn), compute fy
From XYZ to Lab: L* = 116·f(Y/Yn) − 16, a* = 500·[f(X/Xn) − f(Y/Yn)], b* = 200·[f(Y/Yn) − f(Z/Zn)], using the same
CIELABCIEXYZ transformations are foundational in color management, enabling device-independent color specification, color matching, and perceptual color