Module 3: The Transitional Period, 1940 to 1960

Lesson 3.2C: Colour in Film
The American Widescreen Museum Presents Early Color Motion Picture Processes
http://www.widescreenmuseum.com/oldcolor/index.htm

Lesson 3.2C: New Technologies
The American Widescreen Museum and Early Color Process Resource Lobby: The Widescreen Process Wings
http://www.widescreenmuseum.com/widescreen/index.htm

More on Colour in Film:

The World As One Whole: The Syntactic Role of Colour in Film
http://www.kinema.uwaterloo.ca/rotem031.htm

Techinicolor
http://www.widescreenmuseum.com/oldcolor/technicolor1.htm

More on the use of widescreens in film:

More than a hundred years of film sizes
http://www.xs4all.nl/~wichm/filmsize.html#STANDARD

Currently used movie formats
http://hsvmovies.com/static_subpages/formats/shooting_formats.html