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Metrics
Maximum ∆H CMY sol-
ids
Average ∆H composite
grays
Maximum ∆H composite
grays
NOTE
Patches of the target chart on page 259
Refer to
△L (Delta L)
Metrics
Average |∆L| composite
grays
Maximum |∆L| compo-
site grays
Average weighted |∆L|
composite grays
Maximum weighted |∆L|
composite grays
Average |∆L| K-only
patches
Maximum |∆L| K-only
patches
Average weighted |∆L|
K-only patches
Maximum weighted |∆L|
K-only patches
Estimated black point |
∆L|
Description
Highest colour difference in ∆H between the measured Lab values of
the CMY solid patches on the colour control strip and the Lab values
of the matching patches of the reference printing condition.
Average colour difference in ∆H between the measured Lab values of
the composite grey patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Highest colour difference in ∆H between the measured Lab values of
the composite grey patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
for to read the description of the patches.
Description
Average lightness difference in |∆L| between measured Lab values of
the composite grey patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Highest lightness difference in |∆L| between measured Lab values of
the composite grey patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Average lightness difference in weighted |∆L| between measured Lab
values of the composite grey patches on the colour control strip and
the Lab values of the matching patches of the reference printing con-
dition.
Highest lightness difference in weighted |∆L| between measured Lab
values of the composite grey patches on the colour control strip and
the Lab values of the matching patches of the reference printing con-
dition.
Average lightness difference in |∆L| between measured Lab values of
the K-only patches on the colour control strip and the Lab values of
the matching patches of the reference printing condition.
Highest lightness difference in |∆L| between measured Lab values of
the K-only patches on the colour control strip and the Lab values of
the matching patches of the reference printing condition.
Average lightness difference in weighted |∆L| between measured Lab
values of the K-only patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Highest lightness difference in weighted |∆L| between measured Lab
values of the K-only patches on the colour control strip and the Lab
values of the matching patches of the reference printing condition.
Lightness difference in |∆L| between the measured darkest patch on
the colour control strip and the darkest patch of the reference print-
ing condition. The darkest patch is the patch that has the lowest L*
value.
Overview of colour validation metrics
Chapter 14 - References
377
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