Colorimetric accuracy
Color profiles can be evaluated numerically with regards to color accuracy, which
is relevant e.g. for proofing applications. The figure below illustrates typical print-
and-measure color differences in delta-E (1 dE being the smallest perceivable
difference in theory) for the 46 colors represented in the FOGRA
5
color control
strip processed through the same ISO coated input profile and different HP
Designjet Z3100 Photo Printer output profiles generated with different profiling
packages, on HP Premium Instant Dry Satin paper, in ICC Absolute Colorimetric
mode.
Accuracy Results with Fogra Target (46 Color Patches)
0
1
2
3
4
5
6
7
8
EPS APS ProfileMaker V5 Monaco
Profiling Solution
DE76
Substrate
Mean
Max
Primary
Table: comparing typical print-and-measure color accuracy results for different profiling packages,
using the FOGRA color control strip and the HP Designjet Z3100 printer on HP Premium Instant Dry
Satin paper.
Perceptual rendering
For photographic applications, numerical color accuracy is less important than
what the final print looks like to an observer. Unfortunately this is a rather difficult
thing to measure quantitatively, because we have no access to directly measurable
quantities inside observers’ heads. The results can and do also depend on the type
5
http://www.fogra.org/FOGRAisaninternationalorganizationwiththeobjectivetopromoteprint
engineeringanditsfuture‐orientedtechnologiesinthefieldsofresearch,developmentandapplication,
andtoenabletheprintingindustrytoutilizetheresultsofthisactivity