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Vector Trap module issue

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We don't have any tech support for this so hoping you guys can help. We have been using 4-stage trapping forever without any issue or problem from the customer. Recently though the company that we do this work for reorganized and now we are dealing with different people for the same exact work. The new people we are dealing with do not like the way that the files are trapped. The traps aren't "wrong" they just don't like the way they look when you zoom in on them at 2000% (ugh, see attached image).  So, I have been playing around with the settings within the trap module. My choices are 4-stage, Packaging, or Commercial. I have tried all sorts of different settings within each choice. Not having much luck. The original files are all created in Illustrator (usually CS5, but sometimes 6). 4-stage will put a Trap layer in the Artpro file which is absolutely needed, where as I cannot get the other 2 to generate a trap layer. Packaging and Commercial will put trap in the file, but seem to do it on the first unlocked layer in the illustrator file. I thought a workaround may be to put an empty unlocked layer in .ai file and rename that layer in Artpro, but the traps are inconsistent. The trap it is putting on would be acceptable, but like I said, it's inconsistent and not trapping all the areas it should be. We could trap manually, but the volume is sometimes pretty high and would be too time consuming. We are using Artpro 8.1 and running Nexus 9.0.3. Any help is greatly appreciated.

Also, just for my education, maybe someone could explain what exactly 4-stage trapping is vs Packaging. The manuals that were left to me don't say sh*t.


Can't explain 4-stage trapping, because I just don't know... but clearly it can be seen from the image that it is choking in some spots, and spreading in the rest. It looks like this is occurring when the transition is from a darker background image to a lighter background image. Not familiar with Nexus, (we use Rampage), but in the old Trapwise we used to turn off trapping when an image built with 3 colors met another image with 3 colors; the theory being that there were "enough colors in common there would be no gap." If this is an option for you, then I can recommend that this solution will work.

One other workaround is this: set a 3 mil stroke around the object to be trapped, and set the stroke to overprint. Then, turn trapping off and let the stroke overprint to create a phony trap.

Thanks for the reply. The trap is doing what it's supposed to do because it is color based, thus the choking in some spots and spreading in the rest. It's just that the customer (not the printer, BTW) finds it objectionable. Doing the trapping in illustrator is the way we used to do it years ago for simple jobs, but these are way too complex to do that.


So what is the reason the customer is looking at the trapped file? Is it for proofing purposes? Are they trying to repurpose the file for another use?

If the file is used for proofing and it prints correctly, then maybe the customer needs further education. If they plan on repurposing the file, they shouldn't be using a trapped file.


Hey Greg- you are preaching to the choir on this one. They are looking at the trapped files as part of their QC process. Part of the problem is they are familiar with flexo, not so much with offset sheetfed. The printer that the files go to requires trapped files.


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