Graphics Programs Reference
In-Depth Information
Fig. 6-17 Spectral data files and reference files are just text files with lots of numbers. I opened both in MS Word. To the left is a spectral
data file made from the three-page, 918-patch target from ProfileMaker Pro. All the measured values seen are spectral. To the right is the
reference file, which is the road map the software needs to know where each patch on a target should be and the numeric values of the
target's colors.
ter measured spectral data (see the sidebar, “Spectral Data and Data
Files”). The targets may appear to be unique to each package. However,
in many products, as long as the measured data and an accompanying
reference file (which is a text file) are loaded into the profiling software,
an ICC profile can be built.
The reference file is like a road map that allows the profile-building
software to understand the layout of patches as well as the expected
measured values of the target. The reference file is simply a set of instruc-
tions, or a format for how the measured data is to be collected. This means
it's often possible to use a third-party product like GretagMacbeth's Mea-
sureTool to measure a target and import both the measured data and the
reference file into a different package to build a profile. What is impor-
tant to understand is the direct relationship between the reference file
and the measured data file. Like all the profiles built thus far, there is a
reference and a target. The reference is the expected colors (and expected
format or order of the color patches). The measured data file is the meas-
ured values of each patch. With those two pieces of information, a pro-
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