Graphics Programs Reference
In-Depth Information
Fig. 6-16
Seen here is
GretagMacbeth
MeasureTool module with
the Compare function. I
have two data files from
my Pictrography 4500
using different settings.
The average deltaE is 3.94.
The yellow patches seen in
the larger widow are the
worst 10 percent of all
patches in the two targets.
Placing the cursor over a
patch shows the values
from both targets below.
This is the worst patch, of
all 918, which has a deltaE
of 10.82. Note that
although you're seeing
version 5.0, which has
some additional options,
version 4.0, which can
work in demo mode, will
provide the necessary
average and maximum
deltaE feedback discussed
in the sidebar.
Target Data and Reference Files
As you've seen, there are a number of targets available for producing
printer profiles. Most are unique to the profiling application and most are
custom-tailored to a specific Spectrophotometer. The host software
product usually has some user interface for loading the target, recogniz-
ing the measuring instrument and allowing the user to go through the
process of measuring the data. When the process is complete, a file with
all the measured data usually is created and saved (see Fig. 6-17). This is
optional in some products but you should always save this data file. Most
packages save the data as LAB values even though the Spectrophotome-
