Otherwise, try the following in IDL:
Device, Pseudo_Color=8, Decomposed=0 LoadCT, 39 ; Rainbow+white c = { black : 0, $ blue : .25*!d.n_colors, $ ltblue : .40*!d.n_colors, $ green : .65*!d.n_colors, $ yellow : .75*!d.n_colors, $ orange : .80*!d.n_colors, $ red : .90*!d.n_colors, $ white : !d.n_colors-1 }Then try something like
IDL> plot,indgen(100), color=c.yellow IDL> oplot, indgen(100)/2, color=c.blue
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