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?