Aaaargggh :-) Skickat från min iPhone
> 24 Jul 2014 kl. 19:49 skrev Larry Gritz <[email protected]>: > > The fun with PNG never seems to end. And by "fun", I mean a hot poker in the > eye. > > >> On Jul 24, 2014, at 1:20 PM, Mikael Sundell <[email protected]> wrote: >> >> I seems as if Nuke writes data with associated alpha in PNG files, according >> to the spec it's not valid: >> >> http://www.libpng.org/pub/png/spec/1.2/PNG-DataRep.html >> >> "The color values stored for a pixel are not affected by the alpha value >> assigned to the pixel. This rule is sometimes called "unassociated" or >> "non-premultiplied" alpha. (Another common technique is to store sample >> values premultiplied by the alpha fraction; in effect, such an image is >> already composited against a black background. PNG does not use >> premultiplied alpha.)" >> >> This causes the PNGReader to associateAlpha(…) on already alpha multiplied >> data. Did anyone else experience this problem? >> >> Mikael > > -- > Larry Gritz > [email protected] > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
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