Hig res in studio scenes

Started 5 months ago | Discussions thread
hjs_koeln Regular Member • Posts: 107
Re: Hig res in studio scenes

Somewhat off topic, but I was wondering about this: Is there be anything to be gained by making several multipass shots and stacking them in Photoshop/Affinity with less than 100% opacity each?

It would increase dynamic range (maybe with diminishing returns considering the DR of multipass shots is already very high), but what about sharpness and detail resolution?

evan ts wrote:

knickerhawk wrote:

evan ts wrote:

There are many algorithms that can combine many low-res images into a single hi-res image.
(This one was announced 15 yeas ago: https://users.soe.ucsc.edu/~milanfar/publications/journal/SR-challengesIJIST.pdf )

I think that Silkypix just uses a newer and better hi-res algorithm than ACR.

But that's not what's going on at the raw converter stage to a HiRes raw file. The camera internally merges the subframes using a fixed algorithm (perhaps similar to what's discussed in the linked paper) and outputs an ordinary looking Bayer-style raw file, albeit a much larger one constructed from the subsampling of each normal-sized pixel position. The raw converters are not called upon to do anything different with one of these HiRes raws than they do with normal raws.

The hi-res takes 8 Bayer-shots (2 RGB-shots). The key point is, pixel size is still the same as a normal shot. When all shots are stacked together, pixels are overlapped. So we need a good algorithm to separate the information of overlapped pixels.

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