myront said:
Import the ai file to Corel and BAM! All clipping masks are ignored and/or released
I'm calling BS on that one.
I've been using both CorelDRAW and Adobe Illustrator for over 20 years (currently use Corel X8 and Illustrator CC 2018). The two applications have their own unique strengths and weaknesses, so I prefer having access to the strengths of both. More important: CorelDRAW and Illustrator don't play nicely with each other's files.
And CorelDRAW is no magic bullet for clipping mask pollution from certain types of PDF files. In fact CorelDRAW will often import the PDF artwork with all sorts of odd ball inaccuracies. It's one thing if you're importing objects with solid/flat colored fills. Add in gradients, any steps of transparency or other effects the accuracy of the import goes straight into the toilet. Aside from gradient fills gone all wonky the even bigger problem with bringing polluted PDFs into CorelDRAW is duplicate paths. Corel does nothing about this. You'll have 2, 3 or more copies of the same clipping masked object sitting on top of each other (with at least one or more of those copies having no fill and no stroke). That's a disaster waiting to happen if that artwork is sent directly to a vinyl cutter. You have to get in there and police all the objects to get rid of duplicates and correct any errors with fills.
BTW, Powerclip in CorelDRAW is the same thing as clipping masks in Illustrator.
The root issue of clipping mask pollution in artwork is users creating the PDFs without maintaining Illustrator editing capability. Illustrator provides that option, but not everyone bothers clicking the little check box. Other applications tend to save PDFs by applying clipping masks and even embedded alpha channel TIFF images to any objects with gradients and levels of transparency.
Astute Graphics has an Illustrator plug-in that can fix a lot of problems when importing PDFs into Illustrator, but it's not 100% perfect. For the time it can save the plug-in is a good buy.