Yes, that’s the same thing. By accident, I sent it from the wrong email address initially.
-Stefan > On 15. Jul 2017, at 01:15, Larry Gritz <[email protected]> wrote: > > Sorry, I think this one was clogged in the moderation queue and just now got > dislodged. I believe this is from the subsequent discussion and patches which > have now already been merged. > > >> On Jul 4, 2017, at 12:39 PM, Stefan Werner <[email protected] >> <mailto:[email protected]>> wrote: >> >> Hi, >> >> I ran across one texture that I can’t quite figure out how to deal with it >> correctly using TextureSystem. The original texture is a gray scale PNG with >> alpha channel, and I’m converting it with maketx. I’m trying to get that >> back as RGBA via the gray_to_rgb=1 option in the texture cache, but I always >> get the gray channel as R and the alpha channel as G, with B and A >> empty/default. >> >> I stepped through the code, and I see that in >> TextureSystemImpl::fill_gray_channels(), line 848, the case for two channel >> input files only does the conversion when spec.alpha_channel = 1. When I use >> TIFF for my cache file format, spec.alpha_channel is -1, when I use OpenEXR >> as cache file format, spec.alpha_channel is 0. Maketx apparently only marks >> TIFF as containing an alpha channel when there are 4 or more channels, see >> tiffoutput.cpp line 485. OpenEXR does set the channel name to alpha. >> >> Is there a reason that fill_gray_channels() checks for index of the alpha >> channel rather than just its presence? Is there any way that I can get this >> texture to be read as RGBA through the texture cache? >> >> Thanks, >> Stefan >> _______________________________________________ >> Oiio-dev mailing list >> [email protected] <mailto:[email protected]> >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > -- > Larry Gritz > [email protected] <mailto:[email protected]> > > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
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