Nexus flexo question

[PaRambler]

when trapping process work, should there be any trapping figure in the raster trap of the workflow?

 

[david]

Image Trapping

Image Trapping

While I can't directly speak about the Nexus system, it has been my experience that Image Trap settings are most commonly used with black and sometimes with yellow.

Applying trapping to images with the Cyan and Magenta inks will in most cases result in a noticeable frame around the images that is more objectionable than not trapping.

The images should be trapped into components with Black ink - assuming the black is not already overprinting. Then the other common option is if the object has yellow ink present (yellow, red, green, etc) then it is somewhat common to pull the yellow ink into the image. This creates a trap that is not so dark and yet prevents the halo effect.

These settings are most applicable with Lineart to Image trapping.

Internal image trapping is another story. It is not common at all to apply trapping inside of an image - however there are many cases when this is needed. Someone sends you a job where all of the type and design is done in Photoshop - now you have one big image and it needs trapping. This also is the case if someone sends a transparency job that has been preflattened - again lineart elements are now a big image.

In these cases it is good to have an interactive application where you can create trap zones or control internal image trapping on a job by job basis. To just turn on internal image trapping as a default will result in artifacts in jobs that can cause unexpected results.

Hope this helps.

David Lewis
Trapping.org