How does ACR/LR interpret the RGB data after it’s run through the LUT? What specifically is this referring to? The RGB data being input, output?įor instance if I have a LUT that converts Rec709 Gamut/sRGB Gamma -> Rec709/Cineon > Kodak 2383/Rec709 Emulation would I select space: srgb/clip?īasically do I need to make my LUT loop back into whatever colorspace I define in ACR? For instance ProphotoRGB/Gamma 1.8 -> Rec709/Cineon -> Kodak2383/Rec709 Emulation -> ProphotoRGB/Gamma 1.8. I commented on Julieanne Kost's blog post about it as well. I'm guessing that encoded LUT represents the specified LUT, converted to the working space of ACR (MelissaRGB). xmp file, the color space isn't recorded anywhere, just an encoded LUT. No, the enhanced profile containing the LUT can be applied to any image that ACR / LR can read. '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).'

A Rec 709 LUT applied to an sRGB image will often / usually result in an image acceptably close to that LUT applied to the Rec 709 version of the image, though I can often see differences in the shadows, as you'd expect.

SRGB is pretty close to Rec 709, with the same primaries but modestly differently gamma encoding. '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?'

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