LOW GCR IN CMYK CONVERSION

Question

good morning,I use the Prepress Europe 3 preset with my Adobe application.This preset use the Coated FOGRA39 (ISO 12647-2:2004) profile for CMYK color management.In my indd docuement I've imported 3 cmyk images produced with low black generation (see image).I choose this GCR because of a lot of black area in my images, so I do not want any kink of risk with the black how to manage these images in indesign ?cmyk indesign preset is to keep numeric values and ignore  embedded profile:checking the black channel in color separation preview it seems the right way.what's your opinion ?thx

rob day · Accepted Answer

You might look at the ICC site for downloading profiles and information on how modern profiles are created—to customize a modern profile you would need the hardware and software to create and edit profiles:

https://www.color.org/registry/index.xalter

https://www.color.org/profilingtools.xalter

There is more to a profile than black generation and total ink—all of the color is affected by the profile. If the sheet is coated and the press is actually running to the CoatedFOGRA39 profile, the overall color accuracy of the CoatedFOGRA39 separation and soft proof is going to be better than a Photoshop custom CMYK separation.

Of course I could change the color settings of the image at object level, attributing the color profile saved by Photoshop.

If you want your custom separation values to export to a PDF unchanged, you would need to assign the Photoshop profile to the InDesign document (Edit>Assign Profiles...), leave the image as Document CMYK (select the image and see LinkInfo) and also set the Export>Output Destination to Document CMYK or use No Color Conversion. You would also have to communicate with the printer and make sure they don’t convert the custom CMYK numbers to a different destination at output.

reproo2773183 · Answer

I choose this GCR because of a lot of black area in my images, so I do not want any kink of risk with the black

what's your opinion ?
thx

By @milko259349307s4y

Usually the kink is caused by UCR , where the cmy curves would turn downwards as the black goes up. You should be fine with GCR.

Even though you are creating a Custom Conversion for your separations, Photoshop will still use the FOGRA39 to display (if thats the one set as its Working Space) for CMYK without a profile. It should still be accurate if FOGRA39 matches your print destination.

The legacy dialog predates color profiles. It was a better method of converting DeviceRGB to Device CMYK than simply inversing RGB with CMY at the RIP (almost all RIPs use Profiles these days).

As Rob wrote, It will have no relationship to the conversion you'd get using the FOGRA39 profile. But you can still use FOGRA39 for onscreen proofing.

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