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COLORMAT <n>,L
with specifications START=c1,m1,y1,k1 END=c2,m2,y2,k,2 (corresponding
to CMYK color components) makes a list of <n> FILL colors where
the color changes linearly from the START-color to END-color.
An optional MIDDLE=cm,mm,ym,km specification makes the same thing
in <n> steps changing the color first from START to MIDDLE and then
from MIDDLE to END.

COLORMAT is intended merely as a tool for a sucro
/COLORMAT <n>,L
(with the same specifications) which makes 'color mats' according to
colors defined by COLORMAT.

Detailed information and applications are found on
http://www.survo.fi/papers/ColorChanges.pdf