Delta E expresses the distance between two colors in a defined color space, but it does not identify the production cause or guarantee visual acceptability. In printing, it becomes useful only after the formula, target, M condition, backing, illuminant, observer and sample state are fixed.
What a print Delta E does—and does not—say
A small value indicates that the measured colors are close under the selected calculation. It does not say whether the sample is too light, too red or too dull unless component or hue/chroma information is reviewed. It also does not capture gloss, haze, texture, metallic travel, registration or print defects.
Choose and name the formula
ΔE*ab (often called 1976), CMC, CIE94 and CIEDE2000 weight color differences differently and produce different numbers. CIEDE2000 is often a better general predictor of small visual differences, but the correct formula is the one required by the contract or validated workflow. Never transfer a numerical tolerance from one formula to another.
Control the inputs before comparing values
- Use the same ISO 13655 M condition and instrument geometry.
- Keep backing, aperture, illuminant and observer identical.
- Compare the same substrate and dry or converted state.
- Use the same target revision and any parametric factors.
- Define averaging, rounding and retest rules.
An M0/M1 mismatch or a white/black backing mismatch can create more apparent error than the printing process itself, especially on OBA paper or translucent packaging.
Set a tolerance from evidence
Build a set of samples around the visual acceptance boundary, judge them under the specified viewing condition and measure them with the production method. Check whether the press, substrate and measurement system can hold the proposed limit. Different uses may justify different criteria: a brand spot beside another component can be more sensitive than a pictorial CMYK area viewed alone.
There is no universal print Delta E limit
A defensible tolerance reflects formula, color region, substrate, viewing relationship, customer risk, process capability and measurement uncertainty.
Use direction and trend to control the press
Retain ΔL*, Δa*, Δb* or lightness/chroma/hue components alongside total difference. Trend readings by lane, repeat and time. A stable directional drift can be corrected before total Delta E fails, while a widening range may point to substrate, ink delivery or mechanical variation. Link the acceptance rule to the printed-color method, spot-color control and finished-pack sampling.
Last reviewed 22/09/2026 · Level: Intermediate
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