[Tig] 1080p 4:4:4 from 4K 4:2:0?

Bob Friesenhahn bfriesen at simple.dallas.tx.us
Tue Feb 18 14:55:38 GMT 2014

On Tue, 18 Feb 2014, Iskender Utyushev wrote:
> Dear TIG users,
> Found this article http://www.eoshd.com/content/12140/discovery-4k-8bit-420-panasonic-gh4-converts-1080p-10bit-444
> Is that possible?

It indeed seems possible, but the result is not the same as true 10 
bit.  Averaging 4 8 bit samples does not produce the levels available 
with 10 bits.  However, if the camera intentionally mis-encoded its 
output (with the expectation of postprocessing with a specific 
algorithm) then many more levels could be made available via 

Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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