Graphics Programs Reference
In-Depth Information
Fig. 7-3 Two preset defaults for black generation and total ink for offset and newsprint from the Separation module in ProfileMaker Pro;
I can alter the settings if I wish.
expensive ink can produce the same appearance? Using UCR saves the
printer money on inks, at least in theory, and it allows less ink to hit the
paper and thus dry faster. In addition, it is more likely that a neutral will
be produced since even the smallest impurities of the CMY mix can cause
a colorcast.
GCR works in a similar fashion except that it affects not only neutrals
but many colors in an image. Once again, GCR replaces the right com-
bination of CMY with K to produce the correct color appearance with
less inks. The advantages of GCR are images that appear sharper and
cleaner with colors less likely to shift on press. In addition, lower total
ink percentages and less color inks result in far less registration problems.
Registration describes the lining up of the four colors. When one or
more inks misregisters, severe ghosting of images or text result. An
advantage to using UCR is that colors are made up of less ink and are
easier to edit by the pressman. The pressman has more control and can
make delicate color adjustments on press. If asked, most printers will say
they prefer UCR. GCR provides more options since it affects not only
near-neutrals like UCR but also many colors. In the old days, UCR adjust-
ments were conducted when film was scanned on high-end drum
scanners.
Today these kinds of ink replacements are done with the output
profile; thus it's useful to have an idea what settings to apply when build-
ing CMYK profiles. For separations to newsprint, use UCR. For separa-
tions for offset printing, use GCR.
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