where I can find tutorials for building a miniature green screen set???

[David W. Richardson]

Cameras' primaries are Red, Green, and Blue.

Since it is the camera that needs to provide the distinguishing colors, Red, Green, and Blue are the relevant primaries for keying.


You seem to be thinking like a painter -- colors work differently on digital devices than they do when mixing paints.

Actually, I'm a photographer. So light is my medium. I understand the difference in the way colors work between pigments and light. In pigment, the absence of all color is white, and the presence of all color is black. In light, the opposite it true -- the absence of all color is black, the presence of all color is white.

All that being said, my practical experience with compositing has shown that in less-than-perfect greenscreen lighting conditions, it's necessary to use some latitude in green colors in order to get the composite. And when we start using a wider range of green shade in the compositing, then the existence of blue and yellow in the elements we don't want to turn transparent becomes more important.