Cannot figure out how to turn overprint on/off

Forum|Forum|7 years ago
February 11, 2019
4 replies
17449 views

I retrieved a map with a relief layer that is overprinted. However, I cannot figure out how the person who created it made that relief layer overprint. If I select the relief object, I see that "Overprint Fill" is not checked in the "Attributes" panel, and does not seem to have any effect. My question is how do I locate the switch that turns overprint on/off for that object? In case looking at the file would be useful, it is here: http://terragalleria.com/private/CACAmap1_revised.ai

Conversely, I added a relief layer to another map, and when check the "Overprint Fill" box, no overprinting happens (overprint preview is on):

The file is here: http://terragalleria.com/private/VOYAmap1_revised.ai

Thanks

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Correct answer Mike_Gondek10189183

Overprint does not work when you have like inks between 2 items. So you fill of 5c 10y 8k will not overprint your embedded image made of black

I took the black tint on the selected fill as an exam ple, and you can see that overprints now.

How to use overprinting in Illustrator

I stopped using attributes overprints ever since the transparency multiply came out, as for me is quicker and more efficient.

I could not downlaod the links in your post #11.

Q

qtluongAuthor

Known Participant

More happenings that I don't understand:

1. if I save the raster as a RGB or CMYK, it overprints, whereas if I save it as a greyscale, it does not overprint (as in previous example)

2. The overprint (RGB or CMYK) appears with a red/magenta cast instead of being color-neutral

I am able to reproduce that behavior with a third map as well.

Here are the full production files:

http://terragalleria.com/private/VOYAmap1_revised_relief.ai

http://terragalleria.com/private/REDWmap1_revised_relief.ai

What is the explanation and how to fix to have a color-neutral overprint?

Mike_Gondek10189183

Correct answer

Community Expert

Overprint does not work when you have like inks between 2 items. So you fill of 5c 10y 8k will not overprint your embedded image made of black

I took the black tint on the selected fill as an exam ple, and you can see that overprints now.

How to use overprinting in Illustrator

I stopped using attributes overprints ever since the transparency multiply came out, as for me is quicker and more efficient.

I could not downlaod the links in your post #11.

Q

qtluongAuthor

Known Participant

Thanks again, this solved the problem, and I would never have thought of this!

I mentioned in post #11 that map in greyscale did not overprint, and in both of my files the issue is identical to the one you identified, so I was able to fix it. Just out of curiosity, I am still wondering why a monochrome raster in RGB or CMYK overprinted to a green fill results in a red cast. The text of the links I provided was correct, but for some reason the browser embedded the wrong link. Here they are again, http://terragalleria.com/private/REDWmap1_revised_relief.ai

http://terragalleria.com/private/VOYAmap1_revised_relief.ai

Thank you also for the recommended alternative method, I will make sure to use that instead of overprint going forward!