For grayscale, there are not any options for anything over 16 bits. A 32 bit camera for grayscale would be incredibly sensitive!!!
The only workaround I can come up with is to pretend the image your camera is sending is a color image. In this case, it is a 32 bit image. I'm not sure if this would really work, though.
In any case, you would need to create a custom .icd file for your camera to get everything to work.
Bruce
Bruce Ammons
Ammons Engineering