What illuminant and observer do you use?

D65 (daylight, ~6504 K) with the 2° standard observer — the default for sRGB and web color workflows. If your print measurement reports D50, expect a small chromatic adaptation difference.

How precise are these Lab values?

They are derived from each Pantone's published sRGB equivalent. For absolute precision (production QA), measure your physical chip with a spectrophotometer under controlled lighting — that will give you the authoritative Lab reading.

How do I use Lab values for color tolerancing?

Set a target Lab (from this tool or a measurement). Measure printed samples. Compute ΔE2000 between target and sample. Most brand work uses ΔE ≤ 2 as acceptable, ΔE ≤ 1 as imperceptible.

Perceptual ΔE2000

Pantone to LAB Converter

Look up the CIE Lab values for any Pantone color — the device-independent standard for color science, QA, and spectrophotometer matching.

Lab values for any Pantone in the reference set
D65 illuminant, 2° observer
Perfect for QA and color tolerancing

Direct answer

CIE Lab is the device-independent reference space for color science. Every Pantone has an associated Lab coordinate (under a defined illuminant). Use this tool to look up Lab values for QA, ΔE tolerancing, or spectrophotometer comparisons.

Pantone Library → CIE Lab

Find a Pantone color

Pantone 186 C

lab(42.5, 65.9, 35.7)

HEX

#C8102E

RGB

rgb(200, 16, 46)

CMYK

cmyk(0%, 92%, 77%, 22%)

HSL

hsl(350, 85%, 42%)

HSV

hsv(350, 92%, 78%)

LAB

lab(42.5, 65.9, 35.7)

When you actually need this

Real production scenarios where the pantone to lab converter saves time, prevents reprints, or unblocks a workflow.

Press QA

Set up a press-side ΔE tolerance

Press operator pulls a draw-down and measures Lab with an X-Rite. The Lab target from this tool is the reference; ΔE2000 between target and measurement decides whether the make-ready is signed off or run again.

ICC profiling

Build a Lab target list for custom ICC profiling

Custom ICC profile builds need Lab targets per spot color. Export the Lab for every Pantone in your brand palette, feed into your profile-building software, and the resulting profile carries those targets through the workflow.

Cross-vendor

Compare two suppliers' prints of the same Pantone

Two vendors print the same job using the same Pantone number; the prints look different. Measure each, compute ΔE2000 against the published Lab target, and you have an objective way to escalate or accept.

Recipe lab

Ink kitchen recipe development

Ink-room teams formulate custom blends to hit a Lab target. Start from the published Pantone Lab, then iterate with pigment additions, measuring after each adjustment. ΔE drives the convergence.

Archival

Document a brand color in a colorimetric-stable format

Brand books that quote only HEX or CMYK are fragile — the standards may change. Quoting Lab values (D65, 2°) gives a device-independent anchor that survives ICC profile updates.

Research

Color-difference research on Pantone families

Designers and color scientists studying perceptual relationships between Pantones need Lab data, not RGB. Export the Lab coords for any subset and plot in a* / b* / L* space for analysis.

How it works

The methodology — every step is documented so the answer is reproducible, not magic.

Pick Pantone

Filter the reference set by code or name.

Compute Lab

Our engine converts the Pantone's sRGB reference to CIE Lab (D65, 2°).

Read

Lab values shown alongside HEX, RGB, CMYK for cross-reference.

QA workflow

Use these Lab values as targets for ΔE2000 tolerancing against press output.

Worked examples

Concrete inputs and the matches the tool returns. Useful for spot-checking expected behavior before you trust the output for a real job.

Input	Result	Notes
Pantone 186 C	L 41 / a 64 / b 36	Strong primary red. High a, moderately positive b, mid-dark L*.
Pantone 286 C	L 32 / a 18 / b -54	Deep corporate blue. Strong negative b* (blue), slightly warm a, low L.
Pantone 165 C	L 64 / a 56 / b 67	Saturated orange — both chroma axes highly positive, mid-bright L*.
Pantone 354 C	L 60 / a -55 / b 38	Bright green. Strong negative a* (green), positive b* tilts toward yellow-green.
Pantone Black 6 C	L 11 / a -1 / b -5	Cool neutral black. Very low L, slight negative b gives the cool tint.

Common mistakes to avoid

Comparing D50 measurement against D65 target

Press measurement booths use D50; sRGB-derived Lab uses D65. The same Pantone returns slightly different Lab values under each. Either re-measure under D65 or apply chromatic adaptation (Bradford transform) before comparing.

Skipping the 2° vs 10° observer step

Lab values here assume the CIE 1931 2° observer. Architectural color and large-field signage QA often uses 10°. The Lab values shift by 1–3 units depending on the color. Document which observer your QA pipeline assumes.

Treating the published Lab as the only valid target

Pantone publishes Lab values measured against ISO 12647-2 conditions on coated stock. Print to uncoated, newsprint, or fabric and the achievable Lab is different. Use a substrate-specific Lab target for substrate-specific QA.

Forgetting that Lab* axes are not linear in pigment space

Adjusting an ink recipe by ΔL or Δa is not a simple linear pigment addition. Pigment mixing curves are non-linear — the Lab shift per gram of pigment varies with the starting color. Trust your spectrophotometer feedback loop, not Lab arithmetic.

Frequently Asked Questions

What CIE Lab encodes about a Pantone

Lab decomposes color into three orthogonal axes designed to roughly match human perception. L* is lightness (0 = absolute black, 100 = diffuse white). The chroma axes are a* (negative = green, positive = red) and b* (negative = blue, positive = yellow). Together they describe a color’s appearance independent of how it is produced — ink, light, dye, or pixel.

For any Pantone, Lab is the most stable spec across reproduction chain. A printer who measures Lab on the press sheet can match it to the published target regardless of the substrate or ink brand. RGB or HEX would only describe what the screen approximation looks like, not what the ink actually is.

Illuminant and observer choices that change Lab

Lab is illuminant-dependent. The same Pantone has different Lab coordinates under D50 (5000 K, the graphic arts standard), D65 (6504 K, the web standard), and D75 (cooler daylight). We publish D65 values to match the sRGB pipeline, but production print QA almost always works under D50 in a light booth.

The observer angle matters too. CIE 1931 2° observer is the graphic-arts default; CIE 1964 10° observer is used for architectural color and signage at viewing distance. Most consumer-facing tools quote 2°. If your QA pipeline is built on 10°, convert before comparing.

Reading the Lab values in this converter

L*: 0–100. Pantone Black 6 sits around L* 11; Pantone Bright White around L* 95. Most brand colors fall between L* 30 and L* 75.
a*: typically −60 to +75 for saturated Pantones. Reds, magentas, and warm oranges push positive; greens and cyans push negative.
b*: typically −60 to +85. Yellows and oranges push positive; blues and violets push negative.
Chroma (C*): sqrt(a² + b²). High C* means saturated; near-zero C* means neutral gray.

Lab as the foundation of a color-managed workflow

ICC profiles use Lab as a profile connection space. Any time you Convert to Profile in Photoshop, your color rounds through Lab. Quoting Pantone targets in Lab is the closest you can get to a vendor-neutral, device-independent spec. When you hand off a brand color to a packaging vendor in Seoul, a print shop in Toronto, and an embroidery house in Mumbai, the one number they will all agree on is the Lab value.

Related Converters

LAB → Pantone Pantone → CMYK Pantone → HEX Methodology Why print colors shift Pantone vs CMYK

Pantone to LAB Converter