The highest resolution supported by the Canon WUX450ST is 1920 x 1200 (WUXGA). That's over seven times the resolution of the most common graphics resolution of 640 x 480 (VGA).
A 1920 x 1200 (WUXGA) graphics resolution is actually the best supported resolution across all new comparable spec multimedia projectors.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution across comparable types of projector.
If the resolution of this Canon data projector is too low for you then you might want to consider the Canon WUX6010 Medical (£3,487.20) (640 x 480 (VGA and cheaper)|1024 x 768 (XGA and cheaper)|1360 x 768 (WXGA and cheaper)|1400 x 1050 (SXGA+ and cheaper)|1440 x 900 (WXGA+ and cheaper)|1920 x 1200 (WUXGA and cheaper) and cheaper).