I just took an HDR masterclass last week at AbelCine LA with Dado Valentic, who does an amazing job explaining science and workflow while keeping a refreshing enthusiasm about color. Though the class was HDR Grading and focused strongly on specific workflows, we spent a great deal of time talking theory, color spaces, and general color science. We've come a long way from Rec709 and he does a great job explaining how to "future proof" the work we shoot, grade, and deliver. Including ACES, P3, etc etc. It was a 2day course and walked out with a notebook filled with notes and a better understanding of my work. I was fortunate enough to have the company I'm working with put me up for it but I'd say it was well worth it.