tupp Posted July 14, 2014 Share Posted July 14, 2014 What is the best way to deal with potential banding from the A7s and from other cameras that produce 8-bit files? Here is an example of banding that appeared in A7s footage after pushing it in post. Thanks! Quote Link to comment Share on other sites More sharing options...
Inazuma Posted July 14, 2014 Share Posted July 14, 2014 The banding in that clip is present in the ungraded half too and is just due to compression. You can avoid banding to an extent by using grain. The noise forces the encoder to add more data to those areas of the image. However, with h264, dark areas of the image will always become blotchy unless it's at 30mbps or above. One thing I've found is that some 3D LUTs (especially Osiris) causes banding where others don't. kidzrevil 1 Quote Link to comment Share on other sites More sharing options...
Administrators Andrew Reid Posted July 14, 2014 Administrators Share Posted July 14, 2014 http://www.eoshd.com/content/12923/cure-banding-dslr-footage-gh4-4k-holds-key Quote Link to comment Share on other sites More sharing options...
tupp Posted July 14, 2014 Author Share Posted July 14, 2014 @Inazuma Thanks for the info! http://www.eoshd.com/content/12923/cure-banding-dslr-footage-gh4-4k-holds-key Thank you for linking the article. >One the comments shows the dramatic advantage of "diffuse" dithering over merely applying noise. I have used noise and blurring with still photos to eliminate banding, but with stills it is easy to localize the effect within the image. Has anyone used masks (or other selection tools) to keep blurring/noise/dithering to a local area in video? Quote Link to comment Share on other sites More sharing options...
Rob Bannister Posted July 15, 2014 Share Posted July 15, 2014 I have a video to explain on this I just have to do the voice over. Basically if you can denoise the plate, sharpen the luma and blur the chroma then regrain it should get rid of any banding you have Quote Link to comment Share on other sites More sharing options...
tupp Posted July 15, 2014 Author Share Posted July 15, 2014 I have a video to explain on this I just have to do the voice over. Basically if you can denoise the plate, sharpen the luma and blur the chroma then regrain it should get rid of any banding you haveLooking forward to watching the video!If it is an easy process, I might reconsider shooting with the A7s.Thanks! Quote Link to comment Share on other sites More sharing options...
Rob Bannister Posted July 15, 2014 Share Posted July 15, 2014 NP, I have done the process for Nuke and After Effects. I just sound boring in the videos right now.Will make a point to finish them up Quote Link to comment Share on other sites More sharing options...
Inazuma Posted July 16, 2014 Share Posted July 16, 2014 I tested out EOSHD's method. Original clip [280mb]: http://sebcastilho.com/uploads/Day_3_Original.MOV | Quote Link to comment Share on other sites More sharing options...
tupp Posted July 16, 2014 Author Share Posted July 16, 2014 @Inazuma Very interesting! I can see how the banding is reduced on the third clip (compared to the second clip). However, I confess that I prefer the contrast in the original clip over that in the processed clips. Thanks for the examples! Inazuma 1 Quote Link to comment Share on other sites More sharing options...
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