picture example.png 
In order to set the current color to green, pink, violet, or orange, we will need to use the setrgbcolor word with values of r, g, and b that correspond to the color.
For example, one specific shade of green is rgb(71, 178, 35) in rgb color space using 8 bit coordinates. When normalized, the setrgbcolor command to set the current color to that shade of green is
write "example.ps" 71 255 div
178 255 div
35 255 div
setrgbcolor
newpath
144 144 moveto
144 0 rlineto
0 144 rlineto
-144 0 rlineto
0 -144 rlineto
closepath
fill
showpage Then, we can build this using Ghostscript and get a rendered picture.
build example.png example.ps gs -o example.png -sDEVICE=pngalpha example.ps Below is the image that was generated, with our specific color of green displayed.
picture example.png