Graphics Programs Reference
In-Depth Information
From the
Profile
pop-up menu, select
R800Gloss218.icc
.
From the
Engine
pop-up menu, select
Adobe ACE
.
From the
Intent
pop-up menu, select
Relative Colorimetric
.
Have
Use Black Point Compensation
and
Use Dither
check
boxes on.
Be sure the
Preview
check box is on.
3.
If you toggle the
Preview
check box on and off, you can see the
effect of this profile on the smooth color gradient. Even though
the color gamut changes, over all, the Granger Rainbow looks
fairly smooth; there is no extreme banding or posterization.
4.
From the
Profile
pop-up menu select
R800Gloss918.icc
. It
should be just below the
R800Gloss218.icc
profile you selected
in step 2. This profile was generated from the same printer and
paper but instead of using 218 color patches, 918 patches were
used. What you should see is that there is just a slight bit
smoother transition in several areas in the rainbow. Examine the
darker tones of yellow as well as deep reds. This is subtle but still
visible if you look closely.
5.
From the
Intent
pop-up menu select
Perceptual
and notice the
differences in the rainbow. Toggle back and forth between the
two profiles with
Perceptual
and notice something interesting
happening in the darker red areas of the rainbow. The 288 target
profile actually produces a bit smoother results compared to the
918 patch profile. Larger isn't always better! Once again, the
differences you are seeing between the two profiles is very subtle
and either would produce excellent output quality. However,
let's see how the Granger Rainbow appears when we apply a
profile that isn't very good.
6.
From the
Profile
pop-up menu, select
badprofile.icc
. It should
be rather apparent that this profile has some real problems based
on what you see happening to the gradient. Feel free to try
different rendering intents and toggle back to the R800 profiles
to see the difference between a well-built profile and one that
has problems.
What I actually did was take the 918 R800 profile, open it in the Color-
Sync utility, and alter the embedded spectral data that ProfileMaker Pro
places in its profiles. By changing the values and then importing that back
into ProfileMaker Pro, I generated a new profile and named it
badpro-
file.icc
. Obviously this isn't a recommended procedure. This did allow
me to take the original R800 profile and purposely ruin a portion of the
profile to illustrate what would happen if a few patches within the 918
measured were improperly measured. It takes only a few patches of bad
