: InDesign: TAC of sRGB photos exceeds ink limit - does this cause issues when encapsulated in a PDF-X/3 document for print? I'm using InDesign and I am exporting a photo book for an online
I'm using InDesign and I am exporting a photo book for an online printing service (Blurb) in PDF/X-3 (I use unaltered an Export profile that they provided). In the Output tab of the Export Adobe PDF Settings, Color Conversion is set to No Color Conversion and Output Intent Profile Name is set to their provided CMYK.
If I'm not mistaken, this means that the photos embedded in the PDF will not be converted to CMYK, but instead will retain their original color space (sRGB/adobeRGB).
What is causing me concern, is that the Ink Limit in the Separation Preview Panel, indicates that the dark areas of these RGB Photos, exceed the desired TAC level by the printer (<300%) (I get red regions up to Ink limit of 340%).
Should I do something about it, or is the ink limit of the RGB photos to be managed by the printer and I should not worry?
My idea is that I don't need to, since these files will be color managed by the printer on-the-fly - Is there some fallacy in this?
How does InDesign decide the ink limit of an RGB image? What CMYK conversion does it apply for these calculations?
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The long and short of it is; ask your printer. Every printer will have a different ink limit and process for dealing with anything over that. Some will send you the file back to correct, some will convert themselves, some will explain this to you, some won't. It should be as easy as asking your printer for a color profile and converting to that profile.
As for the separation preview in InDesign, the ink limit is set by you — there's an input right there for you. The CMYK values it uses are its conversion either to your document profile, working space, or — if you have proof colors enabled — your proof color profile.
A quick example...
This is an RGB JPG placed in InDesign, viewing separations with my working CMYK profile and the ink limit set to 260:
This is the same image with "Proof Colors" enabled and my proof colors set to use a profile that limits ink coverage to 260:
The areas that were over the limit are now limited to 260 (so no red warning areas), since it's using the correct profile. Of course this is just a preview so you need to make sure you correctly assign the profile on output and convert your colors using that profile.
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