The color to use to replace the black of the greyscale image.
Light Color
`fore'
RGB Value
The color to use to replace the white of the greyscale image.
Brightness
`brig'
Long
The amount to adjust the brightness of the source by, ranging from -255 (all colors are replaced with black) to 255 (all colors are replaced with white). A value of 0 will leave the brightness unchanged.
Contrast
`cont'
Long
The amount to adjust the contrast of the source by, ranging from -255 (minimum contrast) to 255 (maximum contrast). A value of 0 will leave the contrast unchanged.
