The highest resolution supported by the Canon WUX400ST is 1920 x 1200 (WUXGA). That's over seven times the resolution of a 640 x 480 (VGA) data projector, which is the most common resolution supported by data projectors of this age and spec. 640 x 480 (VGA) is also supported by this data projector. This projector also support supported graphics resolutionss of 1024 x 768 (XGA), 1400 x 1050 (SXGA+), 1440 x 900 (WXGA+) and 1600 x 1200 (UXGA) and 800 x 600 (SVGA).
A 1920 x 1200 (WUXGA) supported graphics resolutions is actually the best supported resolution amongst all comparable spec data projectors that are a similar age to the WUX400ST.
Amongst similar types of projector the worst supported resolution is 640 x 480 (VGA).