histogram with DPX files

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why histogram different when working dpx files.  instead of being solid, it's bunch of horizontal lines.  gets odd when stretch bringing highlights , darkening shadows.

hm..  horizontal lines represet color samples.  1024 10 bit, 256 8?  , if spread 2 far apart, i'm introducing banding?  if that's case, how guys grade red footage has gone through vfx work dpxs without expanding values far , ending banding?  sort of important ui feature documentation has left out.

 

similarly, i'm trying figure importance of 95/685 lines me in actual application.



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