RGB to LAB Converter
Convert an RGB or hex color to CIE L*a*b* values.
Convert color to perceptual LAB
CIELAB is the color space designed so that numeric distance matches perceived difference, which is why it underpins Delta E comparisons and precise lightness edits. This tool converts an sRGB color to L*a*b*.
It first linearises the RGB, transforms to XYZ under the D65 white point, and then to L*a*b*. The L* value tells you lightness on a 0–100 scale, while a* and b* place the color on the green-red and blue-yellow axes.
Accurate and private
It follows the standard sRGB-to-LAB pipeline in your browser, so the color never leaves your device.
Frequently Asked Questions
What is CIELAB?
A perceptually uniform color space where L* is lightness, a* is green-to-red, and b* is blue-to-yellow. Equal numeric steps look roughly equal to the eye.
Why convert to LAB?
It is the basis for perceptual color difference (Delta E) and for adjusting lightness independently of hue, which sRGB cannot do cleanly.
Which white point is used?
The D65 standard illuminant, the common default for sRGB and screen work.
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