A script to add a colour cast to a desaturated image.
When the script is run it adds a colour cast of the foreground colour while leaving blacks as true black and white as white. (The cast applies to the grey tones).
The effect can be adjusted by changing the opacity of the Colcast layer. In addition, there is a Threshold layer which can be adjusted to control the amount of black and white in the image.
By making the Desaturated layer invisible the colour cast can also be applied to RGB images.

david.