Question 1

What is CIELAB (LAB) color space?

Accepted Answer

CIELAB (L*a*b*) is a perceptually uniform color space where numerical distance between colors corresponds to perceived visual difference. L represents lightness (0 = black, 100 = white), a represents the green-red axis, and b represents the blue-yellow axis. It's used for accurate color difference calculations.

Question 2

Why use LAB instead of RGB or HSL?

Accepted Answer

LAB is device-independent and perceptually uniform — equal numerical changes produce equal perceived color differences. This makes it ideal for color matching, quality control, and calculating color differences (Delta E). RGB and HSL are device-dependent and not perceptually uniform.

Question 3

How is HEX converted to LAB?

Accepted Answer

HEX is first converted to linear RGB, then to CIE XYZ color space using the sRGB matrix and D65 illuminant, and finally to CIELAB using the XYZ to LAB transformation with the reference white point.

HEX to LAB Converter

HEX to LAB Converter