ICC Profiles are color profiles that can be applied to files (and images & objects in them) intended to assist with the printing process. We do not recommend using them.
Black & White Interior:
The recommended color mode for B&W interior files is Grayscale. ICC profiles can often produce unexpected shifts in image tone when reaching the printer. A common issue is text that appears to be 100% black on the monitor, but prints as a shade of gray (showing a dot pattern).
Adding these to the file is unnecessary and often causes delays in trying to process the file and assess what the problems are. Oftentimes, we will have to request a corrected file from the publisher. It is best to refrain from using both RGB and ICC profiles.
We do not recommend using an ICC profile for cover files. If one needs to be applied, we recommend the U.S. Web Coated (SWOP) v2.
Color Book Interior:
No profiles recommended. Files should be PDF/X-1a:2001 or PDF/X-3:2002 compliant