Lightroom Classic: Null rendering option and lab colour adjustment

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  • Updated 6 months ago
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Could we have a null rendering intent added, that is an option to NOT compress the colour space prior to printing. This would prevent the 'flattening' of you picture when printed.
At the moment you have to edit in photoshop, convert colour space to your printers ICC profile, and select Absolute. This stretches the tone cure, so when you print with relative intent the picture is as it was on screen.

Could we also have a Lab colour tab to go with the HSL tab. This would allow us to adjust colours in a way that is not possible with HSL

Please, please, please, you nice Adobe people.
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Ian Hoyle

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Posted 6 months ago

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6 months ago
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Andrew Rodney

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What you ask for isn't possible (or desirable). In any ICC workflow, there has to be some Rendering Intent (built into the profiles). The only NULL conversion would be sending the RGB working space data directly to the printer which would look AWFUL! This is only used to print targets to produce ICC profiles and Photoshop and Lightroom cannot do this (PS since CS5; Printing without color management was removed and Adobe provided a utility, (Adobe Color Print Utility for this task). IF your images get 'flatter' (whatever that's supposed to mean), you'll see this by soft proofing and selecting a rendering intent and this soft proof simulates what the image should look like on the print (within the technology we have and your ability to properly calibrate and profile a display for a print match). What you ask for is impossible no matter how many times you say please. If you need more information about ICC color management and rendering intents, do ask. There is no such thing as a null RI!. 
6 months ago
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John R. Ellis, Champion

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Re Lab adjustments, best to post that as a new feature request so that others can vote and comment on it separately from the null rendering topic.
6 months ago
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Ian Hoyle

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OK, sorry, I didn't make myself clear.
I misused Null.
What I mean is the Absolute rendering in Photoshop, that is not aligning the White and Black points, so avoiding the colour shifts and loss of contrast when using either Relative or Perseptual rendering.
2018-04-06T14:44:24+00:00
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Andrew Rodney

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There's very little reason for an Absolute Colorimetric rendering in such a product. It's identical to Relative expect for how white is mapped. It's used for proofing (make my Epson simulate another printer like a Contract Proof). Since LR has no ability to deal with CMYK, it's not a RI that is needed. Again, the ONLY difference between Absolute and RelCol is the mapping of white from source to destination! The two RI is shared in the same profile table Your issues are more likely poor quality ICC profiles. 
(Edited)
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