After the decision to go for seperate RGB ligthing i started a little research as i didn’t knew much about the benefits of this design.
i found these links to be interesting:
- Tri-Color Scanning, Color Negative Film & Color Spaces | by Alexi Maschas | Medium
- https://discuss.pixls.us/t/digitizing-film-using-dslr-and-rgb-led-lights/18825
- Appendix B. Color Characteristics of Scanners and Recorders
- Chapter 3. Scanning
My key take aways are (and please correct me if i am wrong):
ARRI Scanners use RGBI (Infrared), take one or two (HDR) pictures for each color channel. They use a monochromatic sensor. Infrared for dust detection. During the image exposure film, gate, and sensor are locked into position.
For color channel separation it is important to shoot one colour at a time. It is not sufficient to use three leds at once to create “white” light.
The led wavelengths should match the films colour sensitivity peaks.
A monochromatic sensor works best, as it doesn’t have a bayer filter.
I think your approach is generating “white” light with three leds at a time and capturing one image with a bayer sensor. Can this concept really deliver better or same colour quality than the ARRI design or the concept with a high CRI white led? What about bayer sensors an their sensitivity for each colour! Do the leds need to match the bayer sensor rather than the film? I could’t find a discussion on this topic in the forum. I am happy to learn more on this topic.
All the best
Martin
amazing project by the way …