Banding

[sam karr]

Thanx to all. i was just wondering in fact. Simple curiosity from a newbie. As I never really noticed that with my digital still cameras in raw.

[Graeme Nattress]

I've never actually seen banding in actual R3D data - so can you please send me that frame as an R3D Trim and i'll look at it. It's most likely some kind of display artifact.

Graeme

[sam karr]

Then it's some display artifacts yes. I've tried with some r3d from other users and I can notice the same banding when I push the CC heavily. Thanx Graeme.

[Graeme Nattress]

But if the grading tool is working correctly, you shouldn't induce banding from heavy grading either.

Graeme

[Robin Balas]

here is the normal exposed one: http://www.supralumen.com/original
here is an underexposed in redcine-x one: http://www.supralumen.com/banding
It's a imac 27" screen for info.
So maybe you will not see it on your screen.
I just don't understand why the image is perfect when exposed quite normally, even on smooth gradients, but has a lot of banding when exagerating the iso toward under exposition.

The banding is in the bright parts of the shot, thats the area with the most data captured per stop. Bringing that down in post will not show any banding from lack of data captured because there is no lack of data.
If you do it the other way around - shoot underexposed and brighten alot in post then theoretically you could see some banding. But most often the noise structures hides any banding in these very dark areas.
What you see must be from the software or monitor part of the display chain. If the banding patterns doesn't change with zoom ratio, it isn't the monitor, then it is either your graphics card/driver or the software used.
Render out a file and play it through a proper monitor or even a quality HDTV, if it is still there you need to figure out what software is causing it as it is occuring prior to render out, if its gone it could be the grephics driver/card at play - try updating driver or try a different PC/Mac.

MHO.