In Acrobat, or my clients Prinergy system, converting a file to CMYK from RGB produces blacks as expected with the SWOP (U.S. Web Coated (SWOP) v2) profile that comes with Adobe software. That is to say that 100K and tints of K stay 100K and at their repective tint values when converting from RGB to CMYK.
But if no other change is made except the conversion profile is switched to SNAP (SNAP2007.icc from www.color.org) the same blacks that converted as expected with the SWOP profile convert to CMYK, e.g., 240% ink 80% black.
I know there are settings, fixes, workarounds and what have you for this but I want to know why one profile works, what I would call, correctly and one works, what I would call, wrong.
Thanks for any help,
Are the objects tagged with a profile or is there an output intent? What happens if you change your color management preferences to use the SNAP
profile as your CMYK space?
The black generation from RGB to CMYK is built-in to the profile. So, if you don't like the way black is coming out, you need to rebuild the profile. I don't know about SNAP but SWOP & GRACoL publish their data sets online so if you have profile making software you can import their numbers and THEN make a custom black generation curve to you liking. Hope this helps!