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Why XYZ?

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Charles Boileau
Why XYZ?
on Jun 23, 2014 at 4:12:24 pm

Hi guys,

I'm preparing a little workshop on color and LUTs for a local school and I'm missing a bit of info...

Does anybody know why the DCI decided to go for XYZ instead of RGB for theatrical representation? The projectors need to convert the color space to it's native colorspace (RGB).

Was it for security reasons?

Thanks!

Charles Boileau
http://www.chuckntwist.com
Montreal, Canada


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Joseph Owens
Re: Why XYZ?
on Jun 23, 2014 at 4:18:15 pm

[Charles Boileau] "Does anybody know why the DCI decided to go for XYZ instead of RGB for theatrical representation?"

Short answer is that X'Y'Z' covers the universe. Its theoretically an infinite colorspace, into which all others will fit. IE. one ring to rule them all. And its the same agenda.
Choice of whitepoint is another discussion.

jPo

"I always pass on free advice -- its never of any use to me" Oscar Wilde.


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Charles Boileau
Re: Why XYZ?
on Jun 23, 2014 at 4:49:34 pm

So this means that RGB is limited?

Charles Boileau
http://www.chuckntwist.com
Montreal, Canada


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Juan Salvo
Re: Why XYZ?
on Jun 23, 2014 at 5:40:59 pm

RGB is relative XYZ is absolute.

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


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John Pilgrim
Re: Why XYZ?
on Jun 26, 2014 at 6:41:46 pm
Last Edited By John Pilgrim on Jun 26, 2014 at 6:51:18 pm

The XYZ color space (and it's non-linear gamma-encoded cousin X'Y'Z') encompasses color values that don't even exist in the visible spectrum. "Imaginary" as well as actual visible colors. As such, it's a better space for long term storage of color information, because display technology is rapidly progressing to reproduce more of the range of visible colors. By encoding in XYZ now, future displays that have gamuts larger than DCI-P3 or Rec2020 or what-have-you will not be limited by the color space limitations of the data being fed to them. The limitations of whatever acquisition tools were used will still be present, but XYZ provides the maximal gamut to allow future displays to reproduce as much color info as possible from that source. It's a wide color pipe.


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