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Re: ProRes vs ProRes HQ

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Re: ProRes vs ProRes HQ
by gary adcock on Aug 20, 2008 at 5:40:24 pm

Stealing my thunder again eh jeremy???


herb,

I did some extensive testing on this, not finding enough difference to proclaim one better than the other from a visual point of view.

on the other hand- the software converted camera native files to ProRes (NOT HQ) consistently played better on the 5 systems I tested them on. It seems that when you are doing a software conversion to PRHQ files the playback needed to have a higher performance CPU to maintain the playback without dropping frames.

Couple of things to remember- camera captures are 8bit - ProRes is 10bit.

ProRes HQ is forcing the data to completely fill out the entire 10bit space that is 4X as levels of gray as 8bit. (256 vs 1024 levels) where as the "plain" version of ProRes allows the 8bit camera file to just float inside the 10bit color space - only adding the extra information to the video file when it is needed, rather than forcing all of those 768 additional levels of gray to be occupied all the time like the PRHQ version does.

Make Sense?

gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows
Inside look at the IoHD




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