How can I save a PDF using corel draw with a great resolution of the images?

I need to save a corel draw file in PDF but when I do that, all the jpg looks terrible, what I should do to make my photos look like a 300 dpi?



I already tried changing to pre-impression format and publish in pdf.How can I save a PDF using corel draw with a great resolution of the images?
i dont think you can use corel draw for that. you can extract the images from a pdf using adobe's acrobat or nuance's omnipage. then use an image enhancing software like image enhance to enhance the image. http://biphome.spray.se/baxtrom/imageenh