LAB → RGB / HEX
Enter CIELAB values (D65, 2° observer) and convert to display-friendly sRGB + HEX.
HEX → LAB
Paste a HEX color and get CIELAB coordinates for print, imaging, and color analysis.
Delta E (CIE76)
Compare two LAB colors and measure perceptual distance (ΔE*ab).
What is a LAB color calculator?
A LAB color calculator is a tool that helps you work with the CIELAB color space, one of the most useful color models for real-world perception. Unlike RGB (which is device-based), LAB is designed to be more uniform to human vision. That means the distance between two points in LAB has a closer relationship to how different those two colors actually look to people.
If you do any work in digital design, photography, printing, packaging, product color matching, or scientific imaging, LAB gives you a clearer, more objective way to communicate color than simple RGB values.
How to read LAB values
- L* = lightness, from 0 (black) to 100 (white)
- a* = green (negative) to red (positive)
- b* = blue (negative) to yellow (positive)
Because LAB separates lightness from chromatic axes, it is easier to analyze color shifts. For example, if only L* changes, the color becomes lighter or darker without hue moving toward red, green, blue, or yellow.
Why convert between LAB, RGB, and HEX?
Design and web workflows
Most browsers and UI tools still use RGB/HEX for display, while color quality workflows may use LAB for precision. A conversion tool lets you move from perceptual color planning to practical implementation quickly.
Print and manufacturing workflows
Print houses and production teams often discuss tolerance in LAB and Delta E. Designers, however, might still hand off digital proofs as HEX values. A calculator bridges that communication gap.
Color quality control
When comparing a target color with a measured sample, Delta E provides a numeric pass/fail benchmark. Even if two RGB values look close on one monitor, Delta E helps standardize decisions across teams.
Understanding Delta E in plain English
Delta E is a single number that expresses how far apart two colors are in LAB space. In this calculator, CIE76 (ΔE*ab) is used for quick comparison.
- < 1.0: Usually imperceptible
- 1–2: Slight difference, often only visible to trained observers
- 2–10: Noticeable difference
- 10+: Strongly different colors
Exact tolerance depends on industry. Some workflows accept ΔE around 2–3, while premium color-critical workflows require much tighter targets.
Practical tips when using a LAB color calculator
- Use calibrated displays whenever possible.
- Remember that out-of-gamut LAB values may clip when converted to sRGB.
- Use consistent white point assumptions (this calculator uses D65).
- When sharing specs, include the color space and conversion method.
Final thoughts
A good LAB color calculator gives you more than just numbers. It gives you confidence when moving between color theory, digital screens, and physical output. Whether you are matching brand colors, evaluating print samples, or building color-aware software, LAB + Delta E are foundational tools worth mastering.