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From: Helge Blischke <h.blischke@acm.org>
Newsgroups: comp.lang.postscript
Subject: Re: Rainbow printing
Followup-To: comp.lang.postscript
Date: Mon, 15 Jul 2013 18:56:32 +0200
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Cecil Westerhof wrote:

> I would like to print things with a rainbow stripe. So the top would
> be red, the bottom would be violet and the other colours would be in
> between. Is it possible to do this?
> 

It can be done using the shfill operator which requires a shading dictionary 
as the only parameter on the operand stack.

See the PLRM section 4.9.3 "Shading Patterns" for the details.

Helge