Edit file File name : red2green.map Content :% -*- slang -*- % This color map was derived from GMT_red2green.cpt % Copyright (c) 1991-2004, P. Wessel & W. H. F. Smith $1 = [0x00,0x7F,0xFF,0xFF, 0x7F,0xFF,0xFF,0x00]; $2 = [0x00,0x7F,0x00,0xFF, 0x7F,0xFF,0xFF,0xFF]; $3 = [0x00,0x7F,0x00,0xFF, 0x7F,0xFF,0xFF,0x00]; png_add_colormap ("red2green", png_build_colormap (__tmp($1),__tmp($2),__tmp($3))); Save