HP DeskJet 640C 600 600 HP C6614DN (black), HP 51649A (color), C1816A (photo) http://www.hp.com/cposupport/eschome.html us-ascii A hpijs The resolution of 600x600 dpi you get only in black and white. In colour the highest resolution is 600x300 dpi.<p> The best printout quality you will probably get with the "hpijs" driver, provided by <a href="http://hpinkjet.sourceforge.net/">HP</a>. <p> Other drivers as GIMP-Print ("gimp-print"/"stp") or some of the "cdj..." work, too.<p> Use GIMP-Print for 600-dpi grayscale printing.<p>