Quote Originally Posted by ic-racer View Post
I can't tell from the video but is the contrast controlled with LED intensity or time? Does it require two exposures?
Only one exposure is needed. The blue and green LED's are set to specific brightness levels at the beginning of each exposure and are held there throughout the exposure. The brightness levels are chosen so that mid gray is held fairly constant throughout the contrast range. Contrast is set in the conventional way from 0 to 5. Future versions of the software will allow user calibration of contrast for a specific paper/developer combination.