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Overview of colour validation metrics
A colour validation test has a series of metrics that are calculated and evaluated when the test is
performed. (
Overview of colour validation metrics on page 375
)
The tables lists all metrics that can be used in a colour validation test. In practice, a colour
validation test uses a small subset of the available metrics.
The measurements are the measured Lab values of the patches of the printed target chart of the
test.
△
E00 (Delta E 2000)
Metrics Description
Substrate ∆E00 Colour difference in ∆E00 between the measured and the reference
substrate white. For a side-by-side evaluation, the colour control
strip must be printed with the rendering intent absolute colorimetric.
The reference substrate white is compared to the measured simula-
ted substrate white of the printed media.
Maximum ∆E00 Highest colour difference in ∆E00 between the measured Lab values
of the colour patches on the colour control strip and the Lab values
of the matching patches of the reference printing condition.
Average ∆E00 Average colour difference in ∆E00 between the measured Lab values
of the colour patches on the colour control strip and the Lab values
of the matching patches of the reference printing condition.
95th percentile ∆E00 The 95th percentile ∆E00 colour difference between the measured
Lab values of the colour patches on the colour control strip and the
Lab values of the matching patches of the reference printing condi-
tion. This means that 95% of all measured patches have ∆E00 colour
differences smaller than or equal to the metric value.
Maximum ∆E00 CMYK
solids Highest colour difference in ∆E00 between the measured Lab values
of the CMYK solid patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Maximum ∆E00 CMY
solids Highest colour difference in ∆E00 between the measured Lab values
of the CMY solid patches on the colour control strip and the Lab val-
ues of the matching patches of the reference printing condition.
Maximum ∆E00 RGB
overprints Highest colour difference in ∆E00 between the measured Lab values
of the RGB overprint patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
NOTE
• Delta E 2000,
△
E00 is the industry standard. (
△
E (Delta E) on page 262
)
• Refer to Patches of the target chart on page 259 for to the read description of the patches.
Overview of colour validation metrics
Chapter 14 - References 375