jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

A simple way is just to interpolate (separately) the red, green, and blue components of the first and last colors, by determining how much they should change at each step of the gradient.

YuckFoo

#!/usr/bin/perl

   use strict;

   # Desired number of steps
   my $steps = 16;

   # RGB components of random beginning and ending colors
   my @beg = (int(rand(256)), int(rand(256)), int(rand(256)));
   my @end = (int(rand(256)), int(rand(256)), int(rand(256)));
   
   # RGB rate of change from beginning to ending color
   my @delta = ( 
      ($end[0] - $beg[0]) / ($steps-1),
      ($end[1] - $beg[1]) / ($steps-1),
      ($end[2] - $beg[2]) / ($steps-1),
   );
   
   # Calculate colors using beginning color and rate of change
   for my $i (0..$steps-1) {
      printf("%3d %3d %3d %3d\n",
         $i,
         $beg[0] + $i * $delta[0],
         $beg[1] + $i * $delta[1],
         $beg[2] + $i * $delta[2]);
   }
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