I have a big catalog, done in InDesign as a CMYK doc...exported to a Press Quality PDF. Printing it in black only, so I need to convert the doc to greyscale. I've googled for days, tried everything. It converts the doc to greyscale, but it's screwing around with the line weights of any lines I have on the page. I have a 10 point horizontal line at the top and bottom, and the converted greyscale now has a 1 point line! Or I have an Illustrator logo with a 10 point white line around the logo, and the converted document has it down to a .5pt line! It's insane. Everything else seems to be okay. Some of the logos, which are actually already greyscale/black logos, disappear mostly, leaving just a few elements on the page. It's nuts. Last year, I did this exact same thing to the exact same files, and it worked 100% fine. Now, with new versions of ID, Acrobat, it's completely broken.
I'm at wits end. It's 508 pages, and I can not fathom how long it will take me to manually convert the thousands of photos in this thing to greyscale manually. It has to go to press.
I tried converting the master PDF using the Mac Preview app, via the Export > Quartz Filter > Greyscale. It worked correctly, except the prepress guy says all the black text is now 4-C text, so it's useless.
I've tried using Convert Colors under Tools, I tried going through Prepress tools and doing it there, and it's always the same.
Any thoughts here?