P: CMYK soft proofing needed

Hi Jao,

This is a known issue and will be resolved soon.
The reason for disabling the CMYK profiles is that it was being supported partially and had many issues associated with it in the previous versions.
Adobe is working to make it fully functional for all the users.

After the 2015.6 update, Lightroom can no longer select CMYK profiles in the soft proofing section of Develop in the "other" dialog. Only CMYK profiles that had been added using previous Lightroom versions still work. It is as if somehow an earlier version of the Lightroom code had been merged into this version. This will need fixing.

You have a separate LR module for (Blurb) Book creation, yet LR cannot use the (CMYK) Blurb Printing Profile to provide the most accurate soft proofing. This needs to be corrected by supporting CMYK Color Profiles in future versions of LR.

As long most print processes use colors in CMYK it is usefull to get softproof for those processes within LR. This does not mean at all that LR would enable to work on images in CMYK. So I agree the wish to get cmyk softproof in LIghtoom.

Sounds more like I need to speak to the print house then. The profile is definitely CMYK, but it would seem their epson wide format printers want RGB, so the double conversion seems wasteful. The paper manufactures profiles are RGB also.

If the printer takes RGB signals, then you need an RGB profile for conversion and proofing. Otherwise you're doing multiple conversions and losing quality at each step. Doesn't matter what the inks are, what matters is the signals you send to the printer (that it then converts to inks). Even the 16 ink wide format monster printers I have here take RGB signals.

I stand corrected. I may have * completely* misunderstood the whys but the fact still stands I need to proof against a CMYK profile for the prints I want.

Currently I am having to round trip to a PS trial, so I have t proof. I also loose the great flexibility of lightrooms virtual copies, and will have to save a load of Tiffs.

>>Every colour printer I've owned has been CMYK, not RGB.

With the exception of the very few chromagenic printers that use RGB light (lasers, CRT's etc) to expose silver paper, all other printers use CMY(maybe K) and maybe other colors. But you're missing the important difference between the colorants (dyes, pigments etc) used in the printer and the color space necessary to send a document to such printers.

All GDI and Quickdraw print drivers don't understand CMYK, they expect RGB data. While the printer itself may use CMYK colorants, the driver needs to create the conversion to that color space (or CMYKk, CMYKG0 etc) FROM RGB data.

Further, the entire LR path is RGB. This is why the print model works just fine with this color model sending this data to a huge number of printers. CMYK data isn't necessary nor the correct color model to be sending.

The only time sending CMYK data becomes useful is for proofing one CMYK device unto another (Make my Epson simulate a press sheet or contract proof). And you'll need a "RIP" or 3rd party driver that actually understands CMYK and how to produce a CMYK to CMYK conversion for proofing. All of this is well outside the LR usage (you still need the correct driver).

Every colour printer I've owned has been CMYK, not RGB. To proof and export using a CMYK profile is essential to me, as the print house expects CYMK for all their Giclee (inkjet....) prints.

I don't want to spend a fortune for Photoshop simplly to proof and convert, this is madness when proofing and exporting are such core parts of lightroom.