I am designing something in Illustrator and I use a part of a bitmap (JPG) image. I only need it to cover a specific shape so I use a clipping mask and end up using just about 20% of said image. Now when I save as PDF, whichever way I save it, it retains the entire JPG inside the PDF (you don't see it, but it's there). How do I get rid of the 80% I don't use? I'm also fine with throwing out that 80% in the AI file, as long as I get rid of it.
PS: It's for file size purposes.
PPS: Yes, I've tried unchecking editing capabilities and checking acrobat layers.