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HD quicktime looks brighter in After Effects
Dear Creative Cow Members,
If anyone can shed some light on this issue, it would be tremendously appreciated. I use a Macintosh with a Kona 2 I/O capture board.
I have captured a clip from an HD deck that is 1080i using the FCP Uncompressed 10bit codec.
When I compare the captured quicktime on the desktop to that same file inside After Effects, the image in After Effects looks considerably brighter. This is making it very difficult for me to color correct. If I bring my levels down and render it, the new rendered file now looks crushed.
Does this have something to with RGB space, and if so, is there a way to correct this. I have not noticed this problem with SD.
To make matters even more confusing, if I render using the Kona v210 codec (without adding color correction), the rendered file looks exactly the same as the original footage. However, if I render using FCP Uncompressed 10bit codec, the rendered file looks brighter than the original clip. Clearly, using the FCP Uncompressed 10bit is seriously altering the levels of the clip.
Has anyone had this problem and if so, how do you work around this. Could this have anything to do with color space of HD. I have never noticed this type of swing in SD.
Hope I am clear in my explanation. Thanks in advance.
-Frank -
1 Reply
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The conversion from 10bit YUV colour space to 24-bit RGB is probably the culprit here – it does seem to create noticable gamma shifts. As AE only supports working in RGB perhaps you could switch your capture/output to (12bit?) RGB (I know I can do this with my Blackmagic Decklink HD Pro). Of course, this requires a fair bit more video bandwidth, so your RAID may struggle.
Alternatively, BitJazz’s SheerVideo Codec supposedly does very accurate conversion from YUV -> RGB and back. And it’ll save you disk space too, in theory (it’s a lossless video codec). https://www.bitjazz.com/sheervideo/
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