Camera

Posted on by

Back to Camera...

12K camera - big moiré problems? (1 reply and 2 comments)

The Byre
1 week ago
The Byre 1 week ago

I have just been looking at test footage from the new Blackmagic-Design 12K camera and it has big moiré patters on people's clothing.  Basically, if you can see the weave with your eyes, there appear to be severe moiré problems.

Cameras going up to 6K do not seem to have this problem, so that begs the question - is 6K as far as we can go in the real world and will ever-greater resolutions only bring every-greater problems?

dmullenasc
1 week ago
dmullenasc 1 week ago

Actually greater pixel resolutions reduce moire problems, the worse interactive effects happen with coarser, lower resolution pixel grids.  This is why many of the super high-resolution still cameras in the 50MP range tend to not bother with an anti-aliasing filter. At some point when the pixel grid pattern gets tiny enough, it is interacting less often with real-world lines in the image.

I think the problem with the 12K BM sensor might be more to do with it not being a Bayer pattern, it has a 4x4 grid with one "white" pixel (for increased sensitivity), then one red, green, and blue (I believe) -- so (maybe) their de-mosaicing software right now is creating some color moire problems, perhaps that will be improved in time. Or maybe it is inherent in the design... the Panavision Genesis / Sony F35 had color moire problems too due to its RGB striped sensor design and an overly mild anti-aliasing filter designed to get more sharpness at the expense of more moire.

dmullenasc
1 week ago

But the lack of an anti-aliasing filter is probably not helping either, but none of the BM cameras have anti-aliasing filters which is why there are some 3rd party solutions to add them.

The Byre
1 week ago

I hadn't even thought of Bayer patterns - thanks!

I had a look at the BM forums and they are full of speculation on this subject and apparently, BM will upgrade their software to accommodate this.

They also seem to be having software compression problems with their BM-RAW formats.

I'm not a BM user and I am still scratching my head on this rush for ever-increasing resolution numbers. The technical aspects are interesting, but it reminds me of someone learning to juggle live rats - why?

Back to Camera...