This is the same algorithm as V1 from G Bleach Bypass, with the addition of a sharpness control.
Control
Settings
Notes
Bleach Effect Amount
0 to 1
Controls how much black gets added to the image.
Overexposure
0 to 1
Adds a controlled amount of overexposure to help simulate the effect of Bleach Bypass.
Desaturation
0 to 1
Bleach Bypass effects normally desaturate the image. This allows you to control how much desaturation, with 0 being no desaturation and 1 desaturating the image to black and white.
Sharpness
0 to 1
Adds a gritty sharpness, to enhance the feel of the Bleach Bypass.
G Bleach Bypass Sharp 
