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johnrellis
johnrellis
Legend
April 5, 2018
Open for Voting

P: Add Rec 709 to LUT color spaces in new enhanced profiles

  • April 5, 2018
  • 27 replies
  • 7521 views

The new enhanced profiles can include LUTs, but the most common color space for existing LUTs, Rec 709, is omitted: 



There are thousands of Rec 709 LUTs available for video color grading, and allowing Rec 709 LUTs in enhanced profiles would let people achieve the same look for their video and still images.

Note that it would be necessary to include two versions of Rec 709 for gamma 2.2 and 2.4, since those are both widely used.

    27 replies

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    TheDigitalDog
    TheDigitalDog
    Inspiring
    April 5, 2018
    Ah, good to known, thanks. So what happens if the color space isn't in sync? That is, you pick sRGB or ProPhoto but you want Rec 709? Like with ICC profiles, does that screw up the color appearance? And if you use such a LUT, does one have to use them only on images that are in the same color space (seems that wouldn’t be necessary with raws that have to be encoded into something at some point). 
    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    johnrellis
    johnrellisAuthor
    Legend
    April 5, 2018
    "Space" specifies the color space of the LUT. The .cube LUT format doesn't specify the LUT's space, so you've got to tell ACR what it is.
    TheDigitalDog
    TheDigitalDog
    Inspiring
    April 5, 2018
    I get that, but why then select one of the RGB working space options above? 
    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    johnrellis
    johnrellisAuthor
    Legend
    April 5, 2018
    I loaded a LUT in .cube format.  Once it was loaded, then the Space dropdown menu was active.
    TheDigitalDog
    TheDigitalDog
    Inspiring
    April 5, 2018
    But what are you loading there? It's grayed out until you load something right? 
    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
    johnrellis
    johnrellisAuthor
    Legend
    April 5, 2018
    In the New Profile dialog of ACR 10.3, which you get to by holding down Opt / Alt and clicking the New Preset button in the Presets tab.
    TheDigitalDog
    TheDigitalDog
    Inspiring
    April 5, 2018
    Where are you accessing that screen capture? 
    Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
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