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(dvips.info)Color specifications

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Color specifications
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  What is a color specification?  One of three things.  First, it might
be a PostScript procedure as defined in a PostScript header file.  The
`color.pro' file defines 64 of these, including `Maroon'.  This
PostScript procedure must set the current color to be some value; in
this case, `Maroon' is defined as `0 0.87 0.68 0.32 setcmykcolor'.

  The second possibility is the name of a color model (initially, one of
`rgb', `hsb', `cmyk', or `gray') followed by the appropriate number of
parameters.  When Dvips encounters such a macro, it sends out the
parameters first, followed by the string created by prefixing
`TeXcolor' to the color model.  Thus, the color specification `rgb 0.3
0.4 0.5' would generate the PostScript code `0.3 0.4 0.5 TeXrgbcolor'.
Note that the case of zero arguments is disallowed, as that is handled
by the single keyword case (`Maroon') above, where no changes to the
name are made before it is sent to the PostScript file.

  The third and final type of color specification is a double quote
followed by any sequence of PostScript.  The double quote is stripped
from the output.  For instance, the color specification `"AggiePattern
setpattern' will set the `color' to the Aggie logo pattern (assuming
such exists.)