Almost any color corrector I can think of that can take OpenEXR will move it Ito a logarithmic working space of some sort, because grading in linear space would be a nightmare. That’s why ACES, for example, has ACEScc and the more recent ACEScct as grading spaces. To make an analogy, if you had a linear-space radio volume knob in your car, moving it from “off” by an eighth of a turn would perceptually take you to near full-volume. Thus, your radio knob is implemented in such a way as to “grade” the volume of your audio logarithmically and make volume adjustment more comfortable. Color grading is done in log spaces for comparable reasons.
Don’t bake in the log transformation of the data; you’ll just confuse things. OpenEXR (as was EXR before it) has always been for scene-referred, radiometrically linear data. On Mar 20, 2017, at 9:41 AM, Igor Majdandzic <subscripti...@badgerfx.com<mailto:subscripti...@badgerfx.com>> wrote: It's for grading... ________________ Send from the Road Igor Majdandzic Compositor, TD, Supervisor @Chimney Frankfurt Am 20.03.2017 5:37 nachm. schrieb Randy Little <randyslit...@gmail.com<mailto:randyslit...@gmail.com>>: Yeah do whatever they want. exr in float linear is as much dynamic range as one can have. making it log is because someone there doesn't really know what they are talking about from the CG side. Randy S. Little http://www.rslittle.com/<http://www.rslittle.com/> http://www.imdb.com/name/nm2325729/<http://www.imdb.com/name/nm2325729/> On Mon, Mar 20, 2017 at 12:33 PM, Marten Blumen <mar...@gmail.com<mailto:mar...@gmail.com>> wrote: Maybe they are referring to floating point being naturally log in it's precision, or, some effects look better if processed in log instead of linear, apart from that log is a colour space compression technique only afaik. On 21 March 2017 at 05:26, Igor Majdandzic <subscripti...@badgerfx.com<mailto:subscripti...@badgerfx.com>> wrote: Hey, A company wants that we supply exrs in log because it would have more latitude to work with. Does that make sense? Using the curve for log brings everything in 0-1 range, so nothing would have been gained using exrs, right? I know both are containers, but for me linear exrs or dpx in log would be the way to go. Everything else seems weird and disorienting. Is there one argument for log exrs, that I just don't know about. Cheers, Igor ________________ Send from the Road Igor Majdandzic Compositor, TD, Supervisor @Chimney Frankfurt _______________________________________________ Nuke-users mailing list Nuke-users@support.thefoundry.co.uk<mailto:Nuke-users@support.thefoundry.co.uk>, http://forums.thefoundry.co.uk/<http://forums.thefoundry.co.uk/> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users<http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users> _______________________________________________ Nuke-users mailing list Nuke-users@support.thefoundry.co.uk<mailto:Nuke-users@support.thefoundry.co.uk>, http://forums.thefoundry.co.uk/<http://forums.thefoundry.co.uk/> http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users<http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users> _______________________________________________ Nuke-users mailing list Nuke-users@support.thefoundry.co.uk<mailto:Nuke-users@support.thefoundry.co.uk>, http://forums.thefoundry.co.uk/ http://support.thefoundry.co.uk/cgi-bin/mailman/listinfo/nuke-users --------------------------------------------------------------------------------------- This email has been scanned for email related threats and delivered safely by Mimecast. For more information please visit http://www.mimecast.com ---------------------------------------------------------------------------------------
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