Oce VarioPrint i Series Operation Manual page 440

Overview of color validation metrics
NOTE
• The |ΔL| value refers to the absolute value of △L.
• The weighted |ΔL| puts more emphasis on the color differences for light grays, where the K
value is lower than 50%. (
• The Estimated black point |ΔL| metric is called an
target chart is not necessarily the darkest possible color. There could be CMYK values that
reproduce a darker tint. The output profile determines the real black point value.
Patches of the target chart on page 248
• Refer to
△Ch (Delta Ch)
Metrics
Average ΔCh composite
grays
Maximum ΔCh compo-
site grays
Average weighted ΔCh
composite grays
Maximum weighted ΔCh
composite grays
NOTE
• The weighted ΔCh puts more emphasis on the color differences between composite grays,
where C is lower than 50%. (
• Refer to Patches of the target chart on page 248
440 Chapter 15 - References
△L (Delta L) on page
Description
Average color difference in ΔCh between measured Lab values of the
composite grays on the color control strip and the Lab values of the
matching patches of the reference printing condition.
Highest color difference in ΔCh between measured Lab values of the
composite grays on the color control strip and the Lab values of the
matching patches of the reference printing condition.
Average color difference in weighted ΔCh between measured Lab
values of the composite grays on the color control strip and the Lab
values of the matching patches of the reference printing condition.
Highest color difference in weighted ΔCh between measured Lab val-
ues of the composite grays on the color control strip and the Lab val-
ues of the matching patches of the reference printing condition.
△Ch (Delta Ch) on page
252)
estimation because the darkest patch of the
to read the description of the patches.
253)
to read the description of the patches.