The runtime builds color models by using combinations of settings for these three configuration variables:
COLOR-TRANS
INTENSITY-FLAGS
BACKGROUND-INTENSITY
These variables are fully described in Book 4, Appendix H.
We've combined a few settings of these variables to form ten color models that will suit most situations. For example, COLOR-MODEL "1" is equivalent to this combination: Color-Trans "5", Intensity-Flags "34", and Background-Intensity "1".
You can adjust the settings of the three variables individually, whether you use a color model or not. Note that the most recent setting takes precedence.
In the following pages, we give a general description of each model, along with the corresponding component settings, and a picture of the black and white effects caused by the model.