Quantizes the image to four luminance values and tints the screen based on those values. Default values reflect those used by the original Game Boy.

Parameters

• Darkest -The darkest colour, used by pixels with luminance between 0.00 and 0.25.
• Dark - The second darkest colour, used by pixels with luminance between 0.25 and 0.50.
• Light - The second lightest colour, used by pixels with luminance between 0.50 and 0.75.
• Lightest - The lightest colour, used by pixels with luminance between 0.75 and 1.00.