[theora-dev] libtheora alpha 2 release
giles at xiph.org
Mon Jun 9 16:26:56 PDT 2003
On Monday, June 9, 2003, at 11:49 pm, Mike Melanson wrote:
> I must have missed something here. Which different colorspaces are
Currently only three: ITU Rec 601, CIE 709 (now also an ITU spec), and
'not specified'. And all still mean YUV 4:2:0 or 4:1:1, so it's not a
new colorspace in the sense of CMYK or RGB.
The idea is to have a flag indicating one of only a handful of the most
common, so that players can attempt to do color conversion for whatever
device they're driving without huge additional complexity. The example
player just prints out the value of the flag. Likewise, an encoder
should pick the closest colorspace to what it's given as input and
convert (if necessary) to one of the supported options.
This was a compromise between the traditional 'hope for the best' no
specification at all, an the kitchen-sink approach taken by (for
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