functions in color.i -

             brighten, factor  
          or brighten  
 
     brighten the current palette by the specified FACTOR.  
     The FACTOR is the slope of the transfer function for the color value  
     (see to_hsv for a description of the hsv color system); a value of  
     1.0 always remains 1.0, but values near 0.0 change by FACTOR.  
     FACTOR= 1.0 is a no-op.  The default factor is 4.0.  

             dump_palette, name  
 
     dump the current palette under the NAME.  If NAME contains no  
     slash characters, the palette_directory will be prepended to the  
     name.  The name can be fed back to the palette command in order  
     to reload the cumped palette.  

             palette_directory= "~/Gist/"  
 
     holds the default directory for the dump_palette command.  
     The directory name *must* end with "/"; the default is shown.  

             hsv= to_hsv(rgb)  
          or hsv= to_hsv([r,g,b])  
 
     return the HSV representation of the n-by-3 array of RGB colors  
     rgb: red, green, blue from 0 to 255  
     hsv: h= hue in degrees, red=0, green=120, blue=240  
          s= saturation from 0 (gray) to 1 (full hue)  
          v= value from 0 (black) to 1 (full intensity)  
          s= 1 - min(r,g,b)/max(r,g,b)  
          v= max(r,g,b)  

             rgb= to_rgb(hsv)  
          or rgb= to_rgb([h,s,v])  
 
     return the RGB representation of the n-by-3 array of HSV colors  
     rgb: red, green, blue from 0 to 255  
     hsv: h= hue in degrees, red=0, green=120, blue=240  
          s= saturation from 0 (gray) to 1 (full hue)  
          v= value from 0 (black) to 1 (full intensity)  
          s= 1 - min(r,g,b)/max(r,g,b)  
          v= max(r,g,b)/255