afni.nimh.nih.gov

Remove the first header line of text in the file, and make the file tab or space-delimited instead of using commas with each line looking something like this:

1 LH_Vis_1 0.470588 0.070588 0.513725 1

The format is
index label r g b 1

r, g and b values are the red, green and blue values respectively, scaled from 0 to 1.