sorry I just google the first link I could find that seemed relavent. here is the formula from the EXR list.
http://permalink.gmane.org/gmane.comp.video.openexr.devel/1127 I can assure you that MANY large studios do not infact use the old 80s style cineon conversion for precisely the reasons we are discussing. People used to comp 8 bit and all sort of other upleasentness but that has moved on also. More and more I am actually seeing linear .exr from Scanning labs also. ----------------------- Tahl Niran vfx compositor www.tahlniran.com From: [email protected] Subject: Re: [Nuke-users] Grade clamping Date: Thu, 21 Apr 2011 09:25:55 -0700 To: [email protected] This is a setting for Fusion, it might need to be adapted to Nuke. Nuke's default Cineon conversion uses 95 as a black point and 685 as a white point. I would imagine that nearly everyone uses this as it is Nuke's default, and has been industry standard since the 80s. On Apr 21, 2011, at 9:21 AM, Tahl Niran wrote:I didnt think anyone was still using the 95,685 style log ? Most places I have worked in the past few years have been using the Josh Pines technique: http://www.vfxpedia.com/index.php?title=File:JoshPinesLogLin_v01.setting&limit=500 ----------------------- Tahl Niran vfx compositor www.tahlniran.com From: [email protected] To: [email protected] Subject: RE: [Nuke-users] Grade clamping Date: Thu, 21 Apr 2011 12:17:45 -0400 DPX scan with very dark value (below 95) goes under 0 once in linear. What technique do you use in those cases ?On Thu, 21 Apr 2011 16:13 +0000, "Tahl Niran" <[email protected]> wrote: why would you have negative RGB values in a linear pipe? there are many Nuke nodes that will clip at 0, especially mergers. I think you need to take a look at what your colour conversion to linear is doing. the only time I would expect to see negative values would be in secondary channels like pWorld or maybe zDepth and generally speaking the only thing I would use a grade node for is to maybe normalise depth. ----------------------- Tahl Niran vfx compositor www.tahlniran.com Date: Thu, 21 Apr 2011 11:19:15 -0400 Subject: Re: [Nuke-users] Grade clamping From: [email protected] To: [email protected] the reason is in alpha channel - matte. _______________________________________________ Nuke-users mailing list [email protected] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users_______________________________________________ Nuke-users mailing list [email protected] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users --Hugo LéveilléTD Compositing, Vision [email protected] _______________________________________________ Nuke-users mailing list [email protected] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list [email protected] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users _______________________________________________ Nuke-users mailing list [email protected] http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users
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