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 >
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