draw2d image eps color



How do I get color in an eps file using
draw2d's image function?  code snippets:
---------------------------------

   im :  matrix([0.2,0.4,0.6,0.8,1.0],[0.16,0.32,0.48,0.64,0.8],
              [0.12,0.24,0.36,0.48,0.6],[0.08,0.16,0.24,0.32,0.4],
              [0.04,0.08,0.12,0.16,0.2])$

  draw2d( image(im,0,0,1,1)$ --> ok default color console graphics

  draw2d( image(im,0,0,1,1),
         terminal = eps,
         file_name = "case2" )$  --->  gray levels graphics   not ok


  draw2d( image(im,0,0,1,1),
         terminal = eps,
         file_name = "case2" ,
         palette = [1,3,8] )$  --->  same gray levels graphics  not ok

I am using Maxima 5.15 with Windows XP.

Ted Woollett