I'm trying to troubleshoot what I think is odd behavior on the part of a profile I measured from a press. I've been hearing from some of our designers that they are seeing some posterization in their images when they use this new profile.

As you can see from the four images below, when I take Bill Atkinson's LAB test image and a Granger rainbow and convert them to this press profile, there is a significant amount of posterization in the result. The same image converted to Web SWOP v2 or Gracol 2006 does not.

I am unsure if this indicates a problem with the profile (either the file itself, or how the target was read or the profile created), a problem with the press, or simply the reality of what this press is capable of and should be used as-is.

The press profile was created using the ECI2002 target. 15 sheets were measured with an EyeOne Pro, averaged using ProfileMaker 5 and then a profile generated using GCR2 and a TIL of 300%.