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Color loss during compression

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Nolan Maloney
Color loss during compression
on Dec 12, 2011 at 6:18:11 pm

Hey all, first time poster, long time reader.

Got a compression question that I thought you might be able to help me out with.

My friend shot a promo video for an upcoming concert and wanted me to help her smooth out some jaggies in her text. Turns out that somebody told her to compress her original FCP project to H.264 then put text and effects on it in AE. So we went back, converted the whole thing to ProRes 422, converted it to an Animation codec in AE, and compressed it for web delivery in Compressor. Jaggies eliminated.

The curious part is that with each compression, we seemed to lose a bit of saturation throughout the whole video. Kind of like somebody laid a bleach bypass filter over the entire thing. I'm assuming that color data is being erased in the codec transfer but I'd never really had a huge issue with that up until this video. I was wondering if anyone had any thoughts on why this is happening and how to prevent it in the future.

Thanks a lot!


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William Caulfield
Re: Color loss during compression
on Dec 14, 2011 at 1:12:04 am

Could be a problem with QuickTime's take on the color space. I know that's been quite an issue with H.264.

Have you looked at the encoded files in any other player?

William Caulfield
Video Encoding Manager
http://metroencoding.com


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Nolan Maloney
Re: Color loss during compression
on Dec 15, 2011 at 10:24:00 pm

Now that I look at it on VLC player, the file seems to be closer to the original color scheme. Interesting...

So, I could I post this file to look like how it looks in VLC, vs how it looks on vimeo?

Vimeo: http://vimeo.com/33543295 (NSFW, not gross though) PASS: cow
VLC Screenshot: http://imageshack.us/photo/my-images/207/screenshot20111215at519.png/


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William Caulfield
Re: Color loss during compression
on Dec 15, 2011 at 11:58:30 pm

Output an H.264 MP4 and test it in the FLVPlayer. I'm thinking it will look like that on Vimeo.

William Caulfield
Video Encoding Manager
http://metroencoding.com


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