Tutorial:
Flat calibration and how to shot flat images for color cameras

Content:

1. Flat image for color camera
2. Pixel gain differences
3. Hardware setup
4. Exposure
5. Master flat 3D analyze
6. Alternative light source, RGB LED bulb
7. To be continued

4: Exposure

What exposure to choose? They shouldn't be to short, Anders at Astronet remind me that to short and it can interfere with monitors refresh rate. To long and the sensor build up dark-current. You can adjust the monitors contrast and brightness, if this isn't enough, ad an extra diffuser (paper).