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rec.709 (Scene)
Posted:
Mon May 14, 2018 11:04 amby Cristian Thomass
Hi everyone,
Does anybody know what rec.709 (Scene) is? What ¨Scene¨ stands for?
You can find it in Color Space & Transforms - Timeline Color Space.
I can´t find any description in the manual.
Thank you.
Re: rec.709 (Scene)
Posted:
Mon May 14, 2018 11:07 amby Tero Ahlfors
Scene referred instead of display referred.
Re: rec.709 (Scene)
Posted:
Mon May 14, 2018 11:29 amby Cristian Thomass
What gamma is that? I mean, in the camera raw tab there is also a Gamma you can set: rec.709 (Scene).
Re: rec.709 (Scene)
Posted:
Tue May 15, 2018 1:53 amby Peter Chamberlain
It is the official Rec.709 spec … approx gamma 1.96 with linear segment near black
Re: rec.709 (Scene)
Posted:
Tue May 15, 2018 4:06 amby Cary Knoop
Like this:
- rec709 vs gamma 196.png (15.67 KiB) Viewed 9006 times
Re: rec.709 (Scene)
Posted:
Tue May 15, 2018 8:19 amby Cristian Thomass
Thank you.
One more question:
Why is it called "scene"?
Re: rec.709 (Scene)
Posted:
Tue May 15, 2018 10:26 amby Tero Ahlfors
Re: rec.709 (Scene)
Posted:
Thu May 17, 2018 4:39 pmby Cristian Thomass
Hahahah, so funny. Kid, are you 10?
Re: rec.709 (Scene)
Posted:
Sun Jan 16, 2022 8:04 amby ksilva
I'm confused, from what understand "scene referred" means working in a color managed workflow, manipulating the image before the transformation giving you the flexibility to convert and output to different color spaces without having to start grading from scratch to conform to a different colors space. In the other hand "display referred" is where you are basically doing your grading based on what you see in your monitor and outputting to that instead of using color management transforming your final render to the desired color space.
So what confuses me is why do I see "Rec.709 (Scene)" in the non color managed menu. Shouldn't it say "Rec.709 (Display)" because grading in the non color managed setting is displayed referred?
Please educate me because this seems to be complete opposite of what I learned.
Re: rec.709 (Scene)
Posted:
Sun Jan 16, 2022 8:30 pmby rNeil H
The expectation of the "standard" Rec.709 video handling is that the file will be viewed with *both* the camera transfer function *and* the display transfer function. They are both called for in the full specifications.
You are *expected* to grade it with the display transform applied.
Sent from my SM-G960U using Tapatalk
Re: rec.709 (Scene)
Posted:
Wed Aug 09, 2023 12:41 pmby saulmemeteau
This ressource from
Nick Shaw is pure gold of clarity!
https://antlerpost.com/colour-spaces/Rec709.htmlRec.709 / BT1886
Rec. ITU-R BT.709, referred to commonly simply as Rec.709, defines a set of primaries for HD video. Although it is common to refer to a “Rec.709 monitor”, the Rec.709 standard in fact defines only a camera OETF (which is in reality rarely applied exactly in any cameras) and does not define the EOTF of the viewing display. There was therefore some debate as to the correct EOTF for displaying Rec.709 image data until Rec. ITU-R BT.1886, commonly called simply BT.1886, was introduced in 2011.
While the definition only of an OETF makes Rec.709 notionally a scene-referred encoding, in broadcast use camera settings are often modified from the pure OETF for creative reasons, and to cover a wider scene dynamic range. Indeed many cameras’ default “Rec.709” mode does not conform exactly to the standard. This means that the mathematical transform to revert to scene light is unknown, so it does not fit the strict definition of being scene-referred. It therefore becomes what Charles Poynton (in the list of definitions in Appendix A of his PhD thesis) calls “mastering-display-referred”.