I have some big trouble with overprinting images in the AI. Files and images in them, that I have, are already been printed, and there was no trouble with them, overprint worked well and all 100% black in the images was overprinted. But now I'm working with files on the other computer and when I save the PDF, in output preview I see white gaps.
The images are complex logos, so I can't just hit Multiply and forget about it, and they are also on transparent backgrounds, so Multiply in the image itself also don't work. I tried other things that I found on the internet, but they didn't work, I still have gaps and a deadline.
What am I doing wrong? Maybe there is a specific options on Save window, that I missed, but they was chosen on the other computer? Can't check it on that computer thou, because it doesn't exist anymore.
Update: I don't have hairlines! Typography doesn't accept my file, because not all my black is overprinted, it's a trapping problem. i need to make this images to overprint, not a knockout colors under it(