Pantone to LAB Converter
Search any Pantone spot colour and get its CIELAB coordinates — L*, a* and b* under the D65 illuminant. CIELAB is the device-independent reference colour science and quality control are built on.
Values are computed from each Pantone colour's published sRGB equivalent, converted through XYZ under D65.
CIELAB (D65 / 2° observer)
What is CIELAB (L*a*b*)?
CIELAB, usually written L*a*b*, is a mathematical description of colour published by the Commission Internationale de l’Éclairage in 1976. Unlike RGB or CMYK it is not tied to any device: it describes what a colour looks like to a standard human observer rather than what a particular monitor or press does to produce it. That independence is why it sits underneath almost every colour-management system in use today.
It has three axes. L* is lightness, running from 0 at pure black to 100 at diffuse white. a* runs from negative green to positive red. b* runs from negative blue to positive yellow. The two chromatic axes are deliberately built as opponent pairs, mirroring the way the human visual system encodes colour after the retina — you can perceive a yellowish red, but never a reddish green, and CIELAB is structured to reflect that.
The design goal was perceptual uniformity: a fixed numeric distance should look like a similar amount of colour change anywhere in the space. CIELAB only partly achieves this, which is precisely why the colour-difference formulas evolved. Simple Euclidean distance is ΔE*ab, or CIE76. CIE94 and then CIEDE2000 added corrections for the regions where CIELAB’s uniformity breaks down, particularly in blues and in near-neutral colours. ΔE*00 is the metric this site ranks all its industrial-system matches by.
Two details always travel with a Lab value, and it is meaningless without them: the illuminant and the observer. D65 approximates average daylight at roughly 6500 K and is the standard for graphic arts and screen work; D50 is used in some print environments. The 2° standard observer models a narrow field of view, and the 10° observer a wider one. The values on this page use D65 with the 2° observer, which is the combination Pantone, RAL and NCS all publish against.
Pantone vs CIELAB: how they differ
| Pantone (PMS) | CIELAB | |
|---|---|---|
| Type of system | A catalogue of physical ink formulas | A mathematical colour space — no physical samples |
| Device dependence | Tied to specific inks and paper stocks | Device-independent by design |
| What the value means | An index number pointing at a recipe | Coordinates describing appearance to a standard observer |
| Range | 1,341 discrete coated colours | Continuous — every value in between is valid |
| Interpolation | Not possible between catalogue numbers | Native — the space is continuous and measurable |
| Used for | Specifying and reproducing brand colours in print | Quality control, ΔE tolerance, colour management, research |
| Requires | A fan deck and controlled viewing conditions | An illuminant and observer to be stated — D65 / 2° here |
| Measured by | Visual comparison against a printed guide | Spectrophotometer |
Worked Pantone → LAB conversions
Each Pantone colour above is shown with the CIELAB (D65 / 2° observer) values this tool computes for it. Unlike a cross-standard match, this conversion is a calculation rather than a nearest neighbour — there is no ΔE, because nothing is being approximated.
Who converts Pantone to LAB?
Lab values are what you reach for when a colour has to be measured rather than described.
- Print quality control — Press operators measure printed sheets with a spectrophotometer and compare the Lab reading against the target. The ΔE between them decides whether the sheet passes.
- Supplier colour tolerances — A contract that says “match Pantone 186 C” is ambiguous. One that says “ΔE*00 ≤ 2.0 against L* 45.6, a* 67.2, b* 32.1 under D65” is enforceable.
- Cross-material brand consistency — Print, textile, plastic and coating suppliers all use different colourants. Lab gives them one shared target that does not assume any particular process.
- Colour management and ICC profiles — ICC profiles use Lab as their profile connection space, so every conversion between two device profiles passes through it.
- Textile and plastics development — Dye houses and compounders work in Lab and ΔE because visual matching across batches is unreliable at production scale.
- Colour research and academic work — Perception studies, colour-difference research and standards development all express results in Lab coordinates.
How to use this Pantone to LAB converter
This conversion is a calculation, not a match — there is no approximation and no ΔE, because nothing is being substituted.
- Enter a Pantone number or name in the search box and select the colour from the suggestions.
- Read the computed L*, a* and b* values, calculated under the D65 illuminant with the 2° standard observer.
- Copy the full Lab string for a specification, or read the individual axis values from the breakdown grid.
- State the illuminant and observer whenever you pass a Lab value to a supplier — a bare triple is ambiguous and cannot be verified.
- For contractual work, measure the physical Pantone chip with a spectrophotometer rather than relying on values derived from an sRGB equivalent.
Accuracy — read before you specify a colour
The Lab values here are computed from each Pantone colour's published sRGB equivalent, converted through CIE XYZ under D65 with the 2° standard observer. The arithmetic is exact and reversible. What it cannot do is substitute for measuring the physical chip: Pantone's own spectral data for a spot ink differs from the sRGB approximation used to display it on a screen, because sRGB cannot represent every colour a spot ink can produce. For quality control, specification tolerances or anything contractual, measure the actual printed sample with a spectrophotometer.
Lab is the space colour differences are calculated in. ΔE*ab (CIE76) is simple Euclidean distance between two Lab points; CIEDE2000 (ΔE*00) corrects for the regions where CIELAB is not perceptually uniform and is the modern default — it is what this site uses to rank every industrial-system match. As a guide, ΔE*00 below 1 is imperceptible, 1–2 is a commercial match, and above 5 the colours read as clearly different.
In short: conversion values on this page are approximate, because the two systems use different colourants and cover different gamuts. Verify against the official physical colour standard before committing to production, tooling or a signed-off brand spec.