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.r3d – Crushed blacks when rendering to MAINCONCEPT AVC/AAC Internet 1080
I’m doing a test with some 5k r3d files.
When I render to Mainconcept avc/aac ‘Internet HD 1080’, my video is totally crushed. Can I overcome this without changing my timeline footage i.e. adding gamma etc.?
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5 Replies
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MC AVC assumes studio RGB (16-235) as input. You may be passing in full range computer RGB (0-255). If yes, you need a computer to studio RGB levels adjustment.
Most, if not all, the 8-bit render file formats assume studio RGB input.
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Thanks for the swift reply. Specifically how would I go about overcoming this? I’m a bit novice when it comes to this side of editing.
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Well, I have never worked with RED raw files, but I’ll bet they generate full range data, 0-255, upon decode. I have no idea how to test for that in Vegas. Maybe there is an option to control this for RED raw files.
Anyway, if you have 0-255 data, you need to add a Sony Levels effect and use the computer RGB to Studio RGB preset for any output format that expects studio RGB levels. MC AVC, Sony AVC both expect studio RGB.
If all your files are RED you can do this on the output channel. The output effect button is in the preview window. Looks like the normal effect button.
You can also do this as a track effect, if everything on a track in RED, but other tracks are something else.
and of course you can do this on a per event basis.
Choose the mechanism most appropriate.
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Ah thanks for that. Do you know if adding LEVELS in this case will adversely effect image quality, seeing as I will effectively be boosting the image?
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The levels change does not boost anything. It is compresses the range a bit and thus you loose some contrast, but the player on a computer should expand the range so contrast stays the same. Of course something is lost since the range is compressed and expanded, but that is just what we have to live with.
I think the 16-235 thing is one of those legacy things we keep carrying forward from the old days.
In studio, 16 is pure black. Full range, 0 is pure black. This is probably where your blacks got crushed. Levels near black were interpreted as blacker than before.
Let me give you a real life for example. I created a slideshow project with jpegs from a misc digital cams. Jpegs are full range 0-255. I noticed my video was more contrasty and some colors over saturated. I added a computer to studio levels to my track and looked at the jpeg in the windows picture viewer and the video stop at the same shot in media player classic home cinema and they now looked the same.
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