Jim Simon wrote:Here's an additional oddity.
With the GH4 media that was shot Full range (0-255), I do see a difference if I change the Clip Attributes. This is good. I can decide which level I want to work in.
But things get weird during export.
Clip = Full, Export = Full - They do not match (Huh?)
Clip = Full, Export = Video - They match (Huh?)
Clip = Video, Export = Full - They don't match (Expected)
Clip = Video, Export = Video - They match. (Expected)
So, the original clip and the export only match when the export is set to Video, regardless of what the clip is set to. How's that possible?
Like Andrew said:
Andrew Kolakowski wrote:When you export to ProRes etc. whatever you set during export this needs to be matched on import - either full or limited and if this is done then all should be good. Resolve for all YUV based formats assume rather limited range even if e.g. for DNxHR flags say differently.
That pattern of results would be explained by your re-importing the exports at 'video' levels.
Jim Simon wrote:The difference here is that the two Video exports match each other, whereas they were slightly different when using the GH4 media. (The Video export from a Full range clip was slight different from the Video export of a Video clip.)
I assume we are talking about the same clip here and by 'Full range clip' and 'Video clip' you are just referring to the data level assigned on import. If so:
The 'Video export from a Full range clip' will be
compressed to 16-235 (64-940) range
The 'Video export of a Video clip' will be
clamped to 16-235 (64-940) range
As I commented earlier:
Bryan Worsley wrote:Something to be aware of also - if you were to import and 'pass through' (i.e. without any manipulation of levels on the Color page) your full range footage at 'Full' data levels and export at 'Video' levels it will get compressed (proportionately) to 16-235 (64 - 940) range on export, not clamped/clipped
And that explains why:
Jim Simon wrote:Clip = Full, Export = Video - They match (Huh?)
The export in this case will be compressed to 16-235 (64-940), so when re-imported at 'video' levels, the scope profiles will 'match' (or be very similar to) those of the original full range clip imported at 'full' levels.