Enabling Color Combiner
You can enable Color Combiner in any one of the following process
templates:
●
Loose page output
●
Imposition output
●
Final output
To enable Color Combiner in these process templates, in the
Render
section, select the
Do Separations
check box and select the
Always
Use Color Combiner to Convert Spots
check box.
Finding the right color combination
Each CMYK proofing device requires a slightly different combination of
CMYK to simulate a particular spot color because the individual
colorants used for CMYK differ for each proofer. To get a quicker
match to spot colors within the gamut of the proofer, use an ICC profile
for the proofer. To do this, measure the L*a*b* absolute color value of
the spot color that you want to match. Then, use stand-alone software
such as Kodak Profile Wizard, X-Rite ColorShop or Praxisoft VectorPro
to achieve the closest CMYK combination for the L*a*b* color space.
Limitations of Color Combiner
Color Combiner has the following limitations:
●
It can exactly simulate only spot colors that are within the color
gamut of the proofer. For example, it cannot arbitrarily produce a
brighter red spot color.
●
It can produce only a best approximation of colors that are outside
the color gamut of the proofer.
●
For best quality, use Color Combiner for AM spot color screens up
to and including 175 lpi on the Trendsetter Spectrum proofer.
●
If there are many overprints in the same area, the donor pigment
may run out. For example, if a solid CMYK 10-60-80-10 spot color
simulation overprints a solid CMYK 10-80-10-5 spot, there will be
an area where magenta is maximized at 100, instead of 140. This is
the tradeoff for using only one set of media.
●
For best results, use Color Combiner only with Staccato-qualified
halftone proofing media.
When not to use Color Combiner
There are a few instances where you should not use Color Combiner. In
that case, clear the
Always Use Color Combiner to Convert Spots
check box.
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Chapter 14—Color
