Printing Jpeg Image directly from Corel Draw X6

Hi Guys


So i would just like to know, I know that 300dpi is the best for printing but when importing a Jpeg image into Corel, its importing at a much higher dpi so I change it to 300dpi and click print, it does not print nice and clear, looks like a few small thin lines across parts of the image so, is the best then to convert it to a vector - (  PowerTrace to High Quality Image ) or do I need to change the dpi lower or higher or is there something else i need to do for a clear printing result directly from Corel?

Thanks

Olge