standard colors
An internal standardColor[] array contains a 5-intensity per color array of equally spaced colors created as follows:

  DIM color[255]
  DIM intensity[4]
  intensity[0] = 0x0000 ' OFF
  intensity[1] = 0x4000 ' 1/4 intensity
  intensity[2] = 0x8000 ' 1/2 intensity
  intensity[3] = 0xC000 ' 3/4 intensity
  intensity[4] = 0xFFFF ' full intensity
  colorNumber = 0
  FOR r = 0 TO 4
    red = intensity[r]
    FOR g = 0 TO 4
      green = intensity[g]
      FOR b = 0 TO 4
        blue = intensity[b]
        color[colorNumber].r = red
        color[colorNumber].g = green
        color[colorNumber].b = blue
        color[colorNumber].x = colorNumber
        INC colorNumber
      NEXT
    NEXT
  NEXT
'
'   color = 25 * red + 5 * green + blue
'
'   red,green,blue are intensities 0 to 4
'

Human beings do not perceive color intensities linearly.  It is much harder to distinguish similar colors from each other when they are dark or bright, as opposed to intermediate.  Some computers and system software compensate by adjusting colors so equally spaced intensities appear equally spaced.  If they don't, GraphicsDesigner performs color compensation, but only if it knows this kind of compensation hasn't already been performed, and the correction can be made without replacing solid colors with colors simulated by dithering.  Color compensation has no effect on program values.