Calibrate external projector

[wesg]

I'm doing a projector inside a large auditorium using my MacBook and an Epson projector. Every time I've done it in the past, the colors never match up with my screen. What is the best way to calibrate the projector to match my screen better?

 

[OttawaGuy]

http://www.fslps.org.uk/knowledgebase.htm