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DCI-XYZ to 709 LUT

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Daniel Christie
DCI-XYZ to 709 LUT
on Apr 16, 2014 at 5:18:24 am

Hi,

Can anyone point me in the direction of a DCI-XYZ to Rec. 709 LUT. I realise this is going to a smaller colourspace, but the source material is 709 that was converted to XYZ anyway.

Thanks,

Daniel


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Juan Salvo
Re: DCI-XYZ to 709 LUT
on Apr 16, 2014 at 9:18:09 pm

Curious, how much would you pay for such a LUT?

http://JuanSalvo.com
http://theColourSpace.com


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Nat Jencks
Re: DCI-XYZ to 709 LUT
on Apr 16, 2014 at 11:26:04 pm

There are multiple ways to do this (going from a wider gamut to smaller), one way is to simply clip colors which fall outside the target gamut. Another strategy is to roll off saturation as it approaches the outer limits of the color gamut, sort of like a soft clip / roll off for gamut.

This second method is a subjective rather than purely mathematical conversion.

Steve Shaw at lightspace will build LUTs one a one off basis, and could certainly provide you with a clipping LUT, and possibly one which rolls off gamut as well.

best-
-Nat


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Juan Salvo
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 3:01:07 am

Nat, worth noting the op was a asking for a LUT coming from XYZ, a simple OoG operation isn't going to cut it. You need a proper color encoding conversion first.

http://JuanSalvo.com
http://theColourSpace.com


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Nat Jencks
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 3:20:44 am

Juan your right, I was thinking it was encoded as DCI/P3 and targeting Rec709 in which case the gamut conversion would be P3>rec709 as well as changing the encoding XYZ>RGB.

Daniel, if your source was in fact rec709 and so its all in-gamut for rec709 perhaps all you need is conversion from XYZ to rec709 RGB. I believe Steve Shaw should be able to sell you with a LUT to do this.
best
-Nat


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Alan Gordon
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 2:11:25 am

If you're coming from XYZ that was created from a REC709 source, you can create a LUT that will work fairly easily yourself with a copy of Photoshop and a copy of Resolve...


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Juan Salvo
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 3:02:08 am

Curious how you would do such a thing, the currently available methods in photoshop would produce a mismatched white point.

http://JuanSalvo.com
http://theColourSpace.com


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Andy Winter
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 8:06:32 am

aha! which available methods are there?


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Alan Gordon
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 8:46:55 pm

Juan, it seems like you're right. There is indeed seem to be a slight shift with Adobe's XYZ profile.

Why the heck is this?

More oft than not color feels like the wild west...


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Juan Salvo
Re: DCI-XYZ to 709 LUT
on Apr 17, 2014 at 9:01:13 pm
Last Edited By Juan Salvo on Apr 17, 2014 at 9:02:28 pm

And like the wild west, the fastest, most accurate gun wins. :)

It shouldn't be a slight shift... it would be fairly significant one. Within reason of course.

http://JuanSalvo.com
http://theColourSpace.com


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Paul Provost
Re: DCI-XYZ to 709 LUT
on Apr 18, 2014 at 3:40:45 am

Sometimes a whole bunch of arrows wins

http://www.filmandtvcolor.com | colorist | Los Angeles, CA

Twitter: @4kfinish


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Juan Salvo
Re: DCI-XYZ to 709 LUT
on Apr 18, 2014 at 3:50:20 am

Not in the long run. :(

http://en.wikipedia.org/wiki/Trail_of_Tears


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Andy Winter
Re: DCI-XYZ to 709 LUT
on Apr 18, 2014 at 10:14:02 am

juan, if the native americans have no future
in the long run, do you mind to share this
adobe arrows? :)


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