This is a link to Jeremy Selan‘s excellent run down on colour management. Jeremy is the man behind OpenColorIO, now supported in Nuke.
The PDF is the course notes for the masterclass he gave at Siggraph 2012 about the subject.
I didn’t get the chance to get to Siggraph, but either way this is probably easier to understand read than lectured.
Looky here: http://cinematiccolor.com/