How does Dye Transfer work?

[Vivaldi]

How those 3 colors make all colors when they come together?

[Danzigdawson]

I don't know about dye transfer, but it looks identical to process printing. Process printing uses 4 colors that are superimposed: cyan, magenta, yellow and black. It's also called CMYK, using the first letter of each color, but the black being 'K' because cyan is some kind of Blue.

Each color is separated and broken down into a cluster of tiny dots: that's halftoning. Halftone are tiny dots that are used in printing to print a complex image — like a photography— using only one color. That was invented in the mid to late 19th century as a practical way to print photographs in newspapers.

When the haltoned color is printed altogether with the others in superimposition, it creates an optical illusion. If you look at the result with a magnifier, you will only see tiny dots, but if you back away, you'll get the illusion of color.

Each color has a specific angle when it comes to halftoning, so that they're not just printed over one another. The angle allows for the dots to create the illusion.

[Vivaldi]

It's Technicolor Dye Transfer Process

Which was used in films shot in both 3 strip Technicolor and eastmancolor

[Vivaldi]

There is also Kodak's dye transfer photographic process which was used in still photographs

[NathanDavis]

I bet you cal tell me all about it...