DisplayMaker Legacy ColorMark+ - User Guide

1-10 Color Management Overview
The CIE L*a*b* Color Model
The non-linear CIE Yxy color model was mathematically trans-
formed in 1976 to the uniform CIE L*a*b* model, in which dis-
tances between colors more closely match those perceived. All
colors of the same lightness lie on a circular flat plane, across
which are the a* and b* axes. Positive a* values are reddish,
negative a* values are greenish, positive b* values are yellowish
and negative b* values are bluish. Lightness varies in the vertical
direction.
The ColorMark+ software allows you to adjust the hue, satura-
tion, lightness, and contrast in RIP Saver files. This saves you
from having to adjust the original file in the application pro-
gram, and re-RIP the file.
Why Color Management
is Needed
To match colors in printed output to those in scanned originals
is not a simple task because of a number of variable factors in
the reproduction chain:
◆ Different image-capturing devices generate different output
values when reading the same original.
◆ Adjustments to monitor controls cause wide color variations.
◆ Gamut differences between monitors and printing processes
mean that unprintable colors can be introduced during
image retouching.
Fig. 1-1. The CIE L*a*b* color space