Graphics Programs Reference
In-Depth Information
CMYK Working Space
Desktop inkjet printers from most of the major manufacturers (like Epson,
HP and Canon) actually require RGB data rather than CMYK data to produce
prints, even though these printers operate in a CMYK working space. What this
means to the average user is that the choice you make for CMYK settings will
have no inl uence in the actual image output (to an inkjet printer). Therefore,
the CMYK settings are better left to the default U.S. Web Coated (SWOP) v2
until you need to work with of set press. As press settings vary considerably,
and getting accurate color or neutrality on press is incredibly dii cult, you
will need to consult your service provider for the best conversion settings
according to the specii cations of the printer and output variables (and pray
you get to work with someone who actually knows what they are doing).
CMYK working spaces are essentially printing processes characterized by
various ink-and-paper combinations, dot gain settings and separation options
such as ink limits. If you have a custom press proi le, you would select it as
your CMYK working space. When you perform a mode change to or from
CMYK, Photoshop will use the CMYK working space proi le for the conversion.
Photoshop will also use the CMYK working space proi le when you open a
CMYK image that lacks an embedded proi le.
If you need to convert images to CMYK but do not have a custom press
proi le, and one is not available from your printer, you will have to select one
of the proi les provided by Adobe, basing the selection on the type of printing
process and paper that will be used, such as U.S. Web Coated (SWOP) v2. The
results however, will unfortunately be fairly disappointing.
As with RGB working spaces, Photoshop provides the ability to create
custom CMYK working space proi les. This is useful if your print provider
does not have a proi le but can tell you what separation settings to use when
converting your images to CMYK. Good luck!
Spot Working Space
The Spot working space is somewhat similar to the grayscale space, but for
spot colors. The options available are a series of i ve preset dot gain settings
and the means for customizing the dot gain curve if desired. The Spot working
space provides a setting for spot colors, such as Pantone colors, that may be
 
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