Hi @rob day Yes - the images were all converted to CMYK in Photoshop and actually converted to Blurbs ICC (CMYK) Profile from RGB images, and assigned to that profile as well. The blacks that were being crushed on-screen cleaned up when I went to the Blurb ICC soft-proof viewing in InDesign. That is good insight about greyscale images. I clicked on the photo in question and followed your direction to assigned profiles and changed the CMYK to the Burb ICC profile and the tones opened up. Very cool insight. Thank you.
You shouldn’t need to turn on Proof Colors. Make sure you don’t have conflicting CMYK profiles embedded in your placed images and the InDesign document —ID’s Overprint Preview will give you the soft proof for Docuemnt CMYK, which should be the Blurb profile (Edit>Assign profiles...):
On the conversion if you set the Intent to Relative Colormetric, and turn on Black Point Compensation the appearance will not change:
Also, unless you are making CMYK color corrections in Photoshop, there is no need to convert individual RGB images to CMYK in Photoshop. Both InDesign and Photoshop use the same color management system, so you can make all the conversions on a single PDF Export. By default the Intent and BPC is handled by your ID Color Settings setup on an Export conversion:
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