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March 27th, 2004, 08:51 PM
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#1 |
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Major Player
Join Date: Jul 2003
Location: Oklahoma
Posts: 424
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resampling
What is the best way to resample minDV (4:1:1) to 4:2:2, b/c I understand it yields better qulity/better chroma-keying? I also heard that canopus A/D convertors can do that? Can anyone shed some light? Thanks.
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March 27th, 2004, 10:00 PM
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#2 |
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Inner Circle
Join Date: Jun 2003
Location: Toronto, Canada
Posts: 4,750
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Do it digitally. A lot of the good keyers will upsample 4:1:1 to 4:4:4. Which NLE are you using and on which platform?
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March 27th, 2004, 10:04 PM
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#3 |
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Major Player
Join Date: Jul 2003
Location: Oklahoma
Posts: 424
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I have Adobe Premiere Pro, After Effects 6.0
How do I do it? |
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March 27th, 2004, 10:05 PM
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#4 |
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Warden
Join Date: Mar 2002
Location: Clearwater, FL
Posts: 8,287
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Does up-sampling create a better image for chroma keying or does it produce banding? I'm not sure, because I've seen mixed results. Any links on this topic?
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March 27th, 2004, 10:44 PM
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#5 | |
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Inner Circle
Join Date: Jun 2003
Location: Toronto, Canada
Posts: 4,750
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I'm pretty sure After Effects has a good keyer that will do the upsampling. I'm not familiar with AE so others can fill in here.
Quote:
suppose your values are 1 2 3 4. You brighten by 50%. That gives: 2 3 5 6 (round up) Reduce the brightness by 33%. That gives 2 2 3 3 On a large scale this should cause bands of the same color to appear. Banding is avoided by using big intermediate numbers (i.e. 32-bit floating point numbers). Does upsampling create a better image for chroma keying? Yes according to Adam Wilt's DV FAQ. http://www.adamwilt.com/DV-FAQ-tech.html#colorSampling |
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