Agree! I'm currently replacing the whole setup with oiio to go directly from production exrs to png/quicktime.
Skickat från min iPhone > 25 Jul 2014 kl. 16:35 skrev Larry Gritz <[email protected]>: > > If Nuke is just inherently writing incorrect PNG files in this situation, it > might also be better to export as OpenEXR, TIFF, or something else that > doesn't have a strict requirement for unpremultiplied alpha, and then as a > second step do "oiiotool nuke_export.exr -o properly_conforming.png". > > > >> On Jul 25, 2014, at 10:32 AM, Mikael Sundell <[email protected]> >> wrote: >> >> Hi! >> >>> Dare I even ask why people are writing PNG files from Nuke? It's not >>> exactly a VFX-friendly file format. >> >> In this case we use Nuke to prepare production assets for webreviews and >> distribution. >> >>> You can force some kind of conversion with oiiotool. If you have a file >>> that saves as PNG but that somehow you know is already premultiplied, you >>> could try "oiiotool --no-autopremult in.png -o outputfile.ext" to suppress >>> the premultiplication that would ordinarily happen when reading PNG files, >>> then write to a new file. >> >> Sounds like a plan! >>>> But you are right, if you assume that Nuke doesn't know if alpha is >>>> associated or not, and some nodes assumes it's not and some assume that it >>>> is, then the situation can't really be improved other than perhaps a >>>> option on the file writer to make it more obvious. >> That's what I had in mind too, just a checkbox in the Nuke PNG reader/writer >> to highlight the potential problem. It's not just the oiio reader that >> premultiplies, Photoshop and other Adobe products does it too. They force >> premultiply based on how data should be present according to the PNG >> specification. >> >> Thanks all! >> >> Mikael >> >> _______________________________________________ >> Oiio-dev mailing list >> [email protected] >> http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org > > -- > Larry Gritz > [email protected] > > > > _______________________________________________ > Oiio-dev mailing list > [email protected] > http://lists.openimageio.org/listinfo.cgi/oiio-dev-openimageio.org
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