Lines colors and thickness

[Julien Demaria <dem@xxxxxxxxxx>]

Hi,

Are there ways to select other different colors (for example choose them 
with R,G,B) than the Ferret default 6 colors black, red, green, blue, cyan, 
magenta (and white with thickness 1 only) ? or Ferret is limited to only 6 
colors and 3 thickness for lines ?

Thanks in advance,

Julien