Why is the PDF of the Color presentation fuzzy/grainy?

If the PDF you have created from DS|Color is not clear enough, you can increase the print DPI to increase the quality of the PDF. In DS|Color proceed to View>Options>Print Tab – set the Print DPI to 256 and if it is still not crisp enough, increase it by 20 or so, then Export to PDF until you are satisfied with the quality.  If the export to PDF crashes you will need to decrease the DPI to the last safe working setting.
in DS|ColorDS|Color FAQ