Projector Calibration?

I just ran a slideshow on a new Canon SX7 projector. The slides look fine on my calibrated display and on our laptop but appear too saturated and contrasty on the projector. These slides are in the Adobe 1998 colour space and the projector is set to the AdobeRGB image mode so a profile mismatch isn’t the issue. Can anyone point me to a good reference on calibrating projectors?

Are you performing the projector calibration in the dark room?