RGB to LAB Converter
Convert RGB colors to CIELAB (L*a*b*) color space with precise mathematical accuracy. Essential for color science, quality control, and calculating perceptual color differences with D65 illuminant standard.
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Complete Guide: RGB to LAB Converter
Everything you need to know about using this tool effectively
The RGB to LAB Converter transforms RGB color values to the CIELAB (L*a*b*) color space. It converts through the intermediate XYZ space using the sRGB transfer function and D65 illuminant. The output includes L* (lightness), a* (green-red axis), and b* (blue-yellow axis). All processing happens in the browser.
This tool applies the sRGB-to-linear conversion, multiplies by the RGB-to-XYZ matrix (D65), then converts XYZ to LAB using the reference white point. The formulas follow the standard CIE definitions.
Measuring perceptual color difference
Convert two RGB colors to LAB and calculate Delta E to measure how different they look.
Print color matching
Convert RGB screen colors to LAB for accurate print color communication.
Color science research
Convert RGB data to LAB for experiments in perceptually uniform color space.
Quality control
Convert production color samples from RGB to LAB for comparison against targets.
Enter RGB values
Type RGB values (0-255) or use the color picker.
View the LAB values
The tool shows L*, a*, b* and the intermediate XYZ values.
Copy the values
Copy the LAB values for use in Delta E calculations or other tools.
L* is lightness (0=black, 100=white). a* negative=green, positive=red. b* negative=blue, positive=yellow.
LAB is perceptually uniform: equal distances represent equal perceived differences.
Use LAB when you need to measure color differences, not just represent colors.
The D65 illuminant is the standard for sRGB and most modern color work.
What is LAB?
CIELAB (L*a*b*) is a perceptually uniform color space. L* is lightness, a* is the green-red axis, and b* is the blue-yellow axis.
Is my data sent to a server?
No. All conversion happens in your browser. Nothing is transmitted.
What illuminant is used?
D65, the standard illuminant for sRGB.
Why is LAB useful?
LAB is perceptually uniform, meaning equal numerical distances represent roughly equal perceived color differences. This makes it ideal for measuring color differences.
Can I use the LAB values for Delta E?
Yes. Convert two colors to LAB and use a Delta E calculator to measure the perceptual difference.
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