I figured I would jump onto this while I have your attention on the topic :-) https://github.com/OpenImageIO/oiio/pull/978
I've kept it at YCrCb across the board, per suggestion. Can you point me at where the extra work should be added to the reader, to support the copy() functionality you mentioned? This is my first time digging into the plugin code, so I am not too familiar with where I should add that bit. Thanks! - Justin On Sat, Oct 18, 2014 at 9:12 AM, Larry Gritz <[email protected]> wrote: > Fine by me. > > > On Oct 17, 2014, at 12:10 PM, Jonathan Gibbs <[email protected]> wrote: > > On Fri, Oct 17, 2014 at 10:26 AM, Larry Gritz <[email protected]> wrote: > >> That's another possibility I would entertain -- automatically upgrading >> the subsampling when a sufficiently high quality is requested. >> > > This seems too magical to me. Those who are setting subsampling levels are > probably expert users and probably thus want what they are asking for > explicitly. > > I set the default quality for jpeg output (if no "quality" attribute is >> found) quite high, 98. I'm also happy to revisit whether that's too much. I >> can't say it was a principled reason for that particular value. >> > > Back when we used 8-bit jpegs in production, they were quality 98, and we > moved over time from 4:2:0 to 4:4:4. When we used "16-bit" jpegs (actually > 12-bits internally) we used 4:4:4 and quality of 75. Some tests determined > that quality of 75 in 16/12-bit looked as good as 98 in 8-bit. > > Anyway, just data points using jpeg images in animation production. > > I'd vote the default to be 4:2:0 since that's what most devices write. > Those who want 4:4:4 are more likely to understand these settings. > > --jono > > > > -- > Larry Gritz > [email protected] > > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > >
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