This IS the Avid L2: [Avid-L2] Re: How to properly handle ProRes 4444 (HD1080P) in Avid SNDX 6.5.4.7?

After running some tests it seems if I import the 4444 ProRes file as an RGB file it comes in at a proper level as far as I can tell. I compared and Avid RGB level import to ama linking to an export made in QT Pro7 to ProRes HQ 422 from the 4444 file and they match.

Here is what I found in the white paper:
Apple ProRes 4444:
An extremely high-quality version of Apple ProRes for 4:4:4:4 image sources (including alpha channels). This codec features full-resolution, mastering-quality 4:4:4:4 RGBA color and visual fidelity
that is perceptually indistinguishable from the original material. Apple ProRes 4444 is a high-quality solution for storing and exchanging motion graphics and composites, with excellent multigeneration performance and a mathematically lossless alpha channel up to 16 bits. This codec features a remarkably low data
rate compared to uncompressed 4:4:4 HD, with a target data rate of approximately 330 Mbps for 4:4:4 sources at 1920 x 1080 and 29.97 fps. It also
offers direct encoding of, and decoding to, both RGB and Y'CBCR pixel formats.

When it says, "direct encoding of, and decoding to, both RGB and Y'CBCR pixel formats." does that mean the video essence can be either RGB 0-255 or 709 16-235? Given what I'm seeing on my file it appears to be RGB levels.

---In avid-l2@yahoogroups.com, <bigfish@...> wrote :

I have received a "Graded" show as a ProRes 4444 file. When I ama link in Avid SNDX 6.5.4.7 the levels are illeagal, pretty much like RGB in 709 space. When I right click to get to source settings it says there are no source settings on this clip. The final delivery is ProResHQ 422. Of course there are not color bars on the file. God forbid I have a chance to actually accurately access the signal path. ;-(

I suppose I can try it on my 8.3.1 startup drive and use some of the new options. Can someone give me a heads up on the proper way to accurately transcode this ProRes 4444 file to ProResHQ 422. I have to add an open title so I will be working in Avid.

I'm thinking I could just export to ProResHQ 422 in QT Pro 7. I'm trying to use the most accurate workflow to maintain the grade. I don't want to just add an Avid color correction to make it legal. This will be for Netflix delivery.

John Moore Barking Trout Productions Studio City, CA bigfish@...

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Posted by: bigfish@pacbell.net

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