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Fun with chroma subsampling
I have had some success using the Color Smoothing 4:1:1 filter on DV footage destined for DVD. However, I am having difficulty with some orange text on blue background. I have placed the source Quicktime (using Animation compression) in a sequence also using Animation compression, then export to m2v using Compressor. The orange-on-blue thing is horrendous. No surprise there I presume? However, if I apply the Color Smoothing filter (either 4:1:1 or 4:2:2) it makes it even worse, which surprises me (though I am pretty new to all this).
See samples here: https://ravenplenty.com/chroma.jpg
Is this the best I can get out of DVD for this type of graphic? Any pointers?
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9 Replies
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use a 10bit sequence and thicken your text a bit.
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I understand how thickening the text would help, but how would using 10-bit help the resulting m2v file, since it has to go back to 8-bit anyway?
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The higer wuality you start, the higer wuality in the end.
Use 8bit, the point is to not use Animation.
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Tried a 10-bit 4:2:2 sequence. No different result than the Animation sequence. I’m just asking too much of DVD compression.
Out of curiosity, what is the reason not to use Animation compressor in a sequence? Thanks for patience with pesky questions.
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[Raven Plenty] “Out of curiosity, what is the reason not to use Animation compressor in a sequence? Thanks for patience with pesky questions.
“Well, in theory it hsould be okay, but since FCP does weird things someitmes, I like to keep things in an ‘editing’ codec of which Animation is not. Try rerendering out of a 16bit project to 10bit using trillions of colors.
And yes, it could be you’re asking too much from DVD.
What frame size are you working in?
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NTSC DVD, 16×9. (720×480)
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Hi Raven,
if your footage is DV NTSC then you have to apply the 4.1.1 Chroma smooth filter because your footage is 4.1.1.
If you go to a 10b sequence, you need to set “Render all YUV in High Precision”, otherwise your DV footage will be rendered in 8b and the Chroma smoothing won’t work that well.
Rafael -
It’s not DV video, it’s a Flash animation exported as a PNG image sequence, then saved as a Quicktime Movie using Animation compression. I did try your suggestion though…no difference in this case, the Color Smoothing filter looks the same as in my posted sample from earlier. I’m pretty sure it’s simply that the detail is too fine for crappy m2v to handle, particularly this colour combination.
Why do pink/red/orange appear so much worse than other colours?
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Sorry man, I read your post too fast.
You are working with Animation files (RGB), so no point to apply a Chroma smoothing filter.
Rafael
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