Introduction to Gamuts

okay so let's step back to the larger problem our finished movies are viewed in a number of different ways for instance the screen and movie is displayed on could be a monitor like this or a projector like this and that's where another problem creeps up both of these displays are getting the same color signal a pure red notice these resulting colors we see aren't exactly the same the problem is display devices like monitors and projectors can only reproduce some of the perceivable colors it's the pure or single wavelength red green and blue light they have trouble creating notice this screen can generate a slightly purrr or deeper red compared to this one remember on our CIE diagram that the purest red green and blue are way out on the edge here here and here but a typical RGB monitor can't create anything close to pure red green and blue light if it tries to display those colors the best it can do is hit three points over here here and here and since the display can blend those colors the device has the ability to create any colors in this black triangle this region is called the gamut of the display device it's the range of the perceivable colors any given device can reproduce mathematicians would say the gamut is a subset of the perceivable color space the size of this set is important to filmmakers because they want the biggest palette of colors to paint from more color means more artistic freedom for a long time our movies were projected on film which has a very large gamut like this eventually we moved to digital projectors which had a different gamut compared to film more recently laser illuminated digital projectors have been introduced which have a much larger gamut than film this is because they use laser light which is very close to a single wavelength allowing them to produce very pure red greens and blues but here's a practical problem for you to think about how do we make sure our movies look good on any device especially if they have very different gamuts you can think about that while working on the next exercise