Most DI apps do now support RGBA DPX files. its a matter of what flavor of DPX that differers. Even Lustre which is RGB uses backburner to stripe the alpha and nest it alla flame style alpha nesting. So its pretty important that Nuke support this correctly. I get asked for alphas and when grading ask for alphas all the time.
Randy S. Little http://www.rslittle.com <http://reel.rslittle.com> On Fri, Nov 18, 2011 at 15:55, Deke Kincaid <[email protected]> wrote: > Most DI apps and film out will error on dpx files with an alpha. Same > with the wrong endian order. > > ------ > Deke Kincaid > Creative Specialist > The Foundry > Mobile: (310) 883 4313 > Tel: (310) 399 4555 - Fax: (310) 450 4516 > > The Foundry Visionmongers Ltd. > Registered in England and Wales No: 4642027 > > > On Nov 18, 2011, at 16:37, Michael Hatton <[email protected]> > wrote: > > DPX specification does support alpha - see 'Image Data' here - > http://www.cineon.com/ff_draft.php > > > On Fri, Nov 18, 2011 at 9:03 AM, John Vanderbeck < > [email protected]> wrote: > >> That was always my understanding. That DPX (being originally based CIN >> for delivering film scans) did not support an alpha channel.**** >> >> ** ** >> >> *From:* [email protected] [mailto: >> [email protected]] *On Behalf Of *rahul kv >> *Sent:* Friday, November 18, 2011 12:30 AM >> *To:* [email protected] >> *Subject:* Re: [Nuke-users] Re: Alpha problem in DPX 2K 10-bit**** >> >> ** ** >> >> I might be wrong but is DPX format not intended for delivering Alpha? *** >> * >> >> ** ** >> ------------------------------ >> >> *From:* terence_fdes <[email protected]> >> *To:* [email protected] >> *Sent:* Friday, 18 November 2011 10:56 AM >> *Subject:* [Nuke-users] Re: Alpha problem in DPX 2K 10-bit**** >> >> *Srikanth wrote:* **** >> >> Check this earlier discussion : >> >> http://forums.thefoundry.co.uk/phpBB2/viewtopic.php?t=358&sid=d31e65d874f2e8ea95a0723b5e4fa8d5 >> >> it might be useful for you! >> >> -sri >> >> Quoting vfxsrini :**** >> >> *Quote:* **** >> >> Alpha problem in DPX 2K 10-bit >> >> We wish to deliver dpx files in 2K 10-bit [2048 x 1156] with an alpha >> channel >> where 3D elements/characters. Basically, it would offer them better >> control in the DI >> >> When we Write a DPX from Nuke with the alpha activated in the write >> node, the resulting image shows up on Avid DS-Nitris or Fusion is a >> black & white image with scanlines.In nuke it showing proper. >> >> Is this a bug, is this not supported or are we just missing something. >> >> In any case, what can we do to offer the best image quality to our client. >> >> Note: On earlier projects when we were outputting to HD [1920 x >> 1080] we never >> faced this problem with DPX files. We also tested tiff with alpha @ 16 bit >> [2048 x 1157] & DPX 2K in 8-Bit - both had no problems. >> >> >> >> **** >> >> >> >> The earlier discussion ended up without any solutions & it was posted way >> back in June 2008. Apparently this seems to be a bug in Nuke and we would >> really appreciate if a quick solution is found. >> >> NOTE: The problem arises when working with CGI elements alone and output >> in "DPX 10-Bit". If one choses to output in dpx 8-bit then there are no >> problems with alpha. However chosing 8-bit is a dead loss and not a >> practical solution when outputting at 2K resolutions - in this case 2048 x >> 1157 for a Animated Feature Film. >> >> Can the Foundry Software development Team look into this at the earliest >> >> Thanks**** >> >> ** ** >> ------------------------------ >> >> >> Avid DS Nitris Colorist**** >> >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users**** >> >> _______________________________________________ >> Nuke-users mailing list >> [email protected], http://forums.thefoundry.co.uk/ >> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >> > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users > > > _______________________________________________ > Nuke-users mailing list > [email protected], http://forums.thefoundry.co.uk/ > http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users >
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