rgb.m: translates a colour from multiple formats into matlab colour format
type 'rgb demo' to get started
[matlabcolor]=rgb(col)
matlab colors are in the format [R G B]
if 'col' is a string, it is interpreted as
[[modifier] descriptor] colour_name
where
modifier is one of (slightly, normal, very, extremely)
descriptor is one of (light/pale, normal, dark)
colorname is a name of a colour
(type 'rgb list' or 'rgb demo' to see them all)
if 'col' is an integer between 0 and &HFFFFFF inclusive,
it is interpreted as a double word RGB value in the form
[0][R][G][B]
if 'col' is a negative integer between -1 and -&HFFFFFF
inclusive, it is interpreted as the complement of a double
word RGB value in the form [0][B][G][R]
if 'col' is a string of the form 'qbX' or 'qbXX' where X
is a digit then the number part is interpreted as a qbasic
color
if 'col' is one of {k,w,r,g,b,y,m,c} a sensible result is
returned
if 'col' is already in matlab format, it is unchanged