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scanning film with sd quattro

Started Mar 11, 2017 | Questions thread
OP Artemka New Member • Posts: 6
Re: scanning film with sd quattro

A multilayer sensor do not give in principle higher resolution. If you scan B/W you must get rid of the Demosaic. This should give you the same resolution as all RGB pixels are avaible w/O interpolation. In stead you must adjust the 2x2 color channels for minimum derivation. This depend on the light source while making a scan/picture with the Bayer cam. It should be best a flash light because of vibration and spectral distribution.

I think RT have the capability to adjust color channels w/o Demosaic

I've tried processing with RPP (Raw Photo Processor), which claims it can take the Luminosity without Demosaic-ing it. The results are somehow inferior to using normally processed files in dcraw. When enlarged to 400% the RPP file shows jagged lines and blotches and is very inconsistent in quality. As I mentioned, I can sort of overcome it by stitching and ending up with higher res, but man, every time I see the micro detail of Foveon...

The issue in the flow w/o Demosaic ist that the luminace response form the RGB is different. This gives the noise. If the three, assuming 2 equal green sensitivities, channels are equalized the noise vanish.

Could you please write your workflow to make a conversion this way?

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