The highest resolution supported by the PT-RZ475 is 1920 x 1200 (WUXGA). That's over seven times the resolution of the most common graphics resolution of 640 x 480 (VGA) (which is also supported by this projector). This Panasonic data projector also supports a graphics resolution of 1920 x 1080 (HD 1080).
A 1920 x 1200 (WUXGA) graphics resolution is in fact the best supported resolution amongst all projectors that have been available for around the same time as the PT-RZ475.
A 640 x 480 (VGA) graphics resolution is the worst supported resolution amongst comparable types of projector.