How to avoid banding????

[Ido Karilla]

I have some shots in a project that exibit very strong banding while outputed to HD qt's. I have tried REDCINE,REDALERT and REDRUSHES I even exported DPX's and converted them with the aja utility to QT's and nothing helps. When watching them in REDCINE they look grate. Those are part of a footage shot on the same day, same camera and same lenses set.

This shots are part of a spot that has meny fade to blaks, on this occasions the banding is probably the only thing you notice. The spot can not be broadcasted like this!!!!

my next step is 4K TIFF's into AE to render out HD matirial.

Any thoughts, ideas or suggestions on the subject will be appriciated.

Thanks.

 

[Charles Angus]

If all else fails, add some noise...

Noise hides banding.

 

[John Tissavary]

I have some shots in a project that exibit very strong banding while outputed to HD qt's. I have tried REDCINE,REDALERT and REDRUSHES I even exported DPX's and converted them with the aja utility to QT's and nothing helps. When watching them in REDCINE they look grate. Those are part of a footage shot on the same day, same camera and same lenses set.

This shots are part of a spot that has meny fade to blaks, on this occasions the banding is probably the only thing you notice. The spot can not be broadcasted like this!!!!

my next step is 4K TIFF's into AE to render out HD matirial.

Any thoughts, ideas or suggestions on the subject will be appriciated.

Thanks.

Quicktime is probably where you are introducing banding, because many codecs, although they techincally are able to contain more than 8 bits (ie.e 10 or 16) still internally use 8 bits to calculate the image, which means it'll band just like an 8bit image file would. Either use ProResHQ, Cineform, or Avid DNxHD, all of which have internal and file container ability to deal with 10 or more bits per pixel.

This is my workflow for Quicktime:

1) Render to DPX or openEXR out of Scratch (or RedCine as your case may be)

2) Import DPX or openEXR sequence to AE

3) Render to DNxHD in my case, but ProResHQ and Cineform work very well, too, depending on your deliverables requirements.


regards,

John T.

 

[jimhare]

Yeah, I've been through this, definitely QuickTime. If you make a DPX or TIFF it's not there so proves it's not a RED issue.

Haven't determined whether it's just a display issue with DVI (8-bit) or if the final output would suffer from it. I suppose making a banded QuickTime and then using AE to create a TIFF sequence from it would be proof enough.

No banding, clean file. Banding means it's baked in.

 

[Ido Karilla]

Thank you all.
The clear to the point replies are very helpful.

Ido.