I have a bunch of keyable graphics from After Effects. They were made in ProRes4444 to accommodate alpha channel. These import into Avid perfectly with no level scaling and they also ama link correctly so I know the video essence must be legal level Rec 709.
The request was made to convert them into Apple Animation codec. When I do this using QT Pro 7, Adobe Media Encoder or After effects the resulting file when imported of linked to in Avid is Full Range 0-255 level.
I have played with the color management in AE with no success. I finally took my color bars Smpte-219 Still I use in Avid and brought that into AE. When I render that out as a .mov the opposite happens. ProRes 444 shows up low in level and the Animation export looks correct in level. What is consistent is that exporting to Animation the levels are higher than exporting to ProRes 444 or ProRes 4444. The offset appears to be the usual difference in scaling between Full Range and Legal Level.
In AE I am taking the exact same composition into the render que twice and exporting to the two different codecs. I played around with the broadcast safe effect but that isn't fixing things. So what is going on here? Why does the same source composition render out at two different levels depending on the codec choice. I'm no Adobe expert but with color management off it says it will not be changing any levels.
As I mention the same discrepancy in levels occurs if I do the conversion in QTPro 7 or Adobe Media Encoder.
I figure by ama linking to the resulting files I am accessing the actual video essence because Avid engineering has said that an ama link bypasses the QT engine and as long as there is no scaling in source settings on the linked clips I'm looking at the actual unaltered video essence levels.
Usually I expect AE generated graphics to have Full Range Levels but some graphic artist know how to properly scale their exports to Rec 709 legal levels. I don't know how they do this and I thought it was maybe the BroadCast Safe Effect but apparently not.
This has become worse than herding cats. Why would the same composition of the color bars still come out at different levels with different codecs. Is there some under the hood scaling that happens with animation codec. I just can't seem to find how to maintain a unity in unity out path when changing between ProRes 444 and Animation. Surely I am missing something obvious?
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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