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1. Re: Premiere Pro and 4:4:4 32-bit float
Harm Millaard Dec 18, 2012 7:27 AM (in response to prescovidprod)See http://en.wikipedia.org/wiki/Chroma_subsampling
4444 is simply RGBA (red, green, blue and alpha) or as Adobe calls it BGRA with 8 bits per channel, thus the 32 bit format. The practical effect is that with certain effects, like chroma keying or CC the loss is minimal. However, this only applies to certain types of video like RED 4K or EPIC 5K. MXF material for instance is still handled as YUV 422.
Some plug-ins like DissolveMaster also upsample to BGRA 4444 to avoid losses and do it even with YUV 420 or YUV 422 material.
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2. Re: Premiere Pro and 4:4:4 32-bit float
Fuzzy Barsik Dec 18, 2012 7:43 AM (in response to prescovidprod)In addition to what Harm said, you may also want to see this The Video Road blogpost on Colour Subsampling and that one on 8-bit, 10-bit and 32-bit Colour Processing.
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3. Re: Premiere Pro and 4:4:4 32-bit float
prescovidprod Dec 18, 2012 8:26 AM (in response to Fuzzy Barsik)I was thinking that the 32 bit part was refering to audio with the capability of having unlimited headroom...
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4. Re: Premiere Pro and 4:4:4 32-bit float
JSS1138 Dec 18, 2012 10:59 AM (in response to prescovidprod)Well, that does happen as well. Incoming audio is often 'conformed' to 32 bit floating point WAV files for actual use in the program.



