Reply To: Help! Print production wants me to use mostly Photoshop

What you’re describing is probably the results of “flattening.” Take a look at this post on the yucky discolored box syndrome and her link to Steve’s Dreaded White Box problem:
https://creativepro.com/eliminating-ydb-yucky-discolored-box-syndrome.php

Those are often problems when people use spot colors in InDesign instead of process colors (but don’t realize they’re using spots).

See this article about the thin white lines: https://creativepro.com/when-you-see-thin-white-lines-in-your-pdf-files.php

The best way to avoid all that is to work with a commercial printer who will accept PDF/X-4 files (instead of the dumb ol’ PDF/X-1a). I talk about how to make good quality PDFs to send to print in my title InDesign Insider Training: Print PDFs at lynda.com.