Share 'PDF file conversion fun'

I use a very old DTP program, CompuWorks Publisher 3.  I use Express PDF Printer to convert the page files to PDFs.   What I don't get is that the results are never consistent.  For instance, one book cover I did has a lot of images added to it.  When I view it in its original DTP form, it looks fine.  Converted to PDF, you can see all sorts of white lines where the art was added.  But the odd th…