Pitxu said:
though I heard that it isn't really a 'color" film !
Disclaimer, I'm not a Photo Engineer<tm> but for some reason I've taken a strange fascination to the way Kodachrome works. I've actually forced myself to understand it.
🙂
Yes, it is a color film. It records images in color, same as all other three-layer color films do.
each layer being sensitive to one of the three primary colors. The layers are then dyed individually during the processing.
A true Photo Engineer<tm> might say that Kodachrome is chromogenic (a point frequently misunderstood) but that it's nonsubstantive.
Some people have this idea that color dyes are added to Kodachrome the same way you would pour Rit into a washing machine. No, the dyes are formed as products of the color developers. (oxides?) (Yes, chromogenic.) There are three color developers, one for each layer, and Kodak's secret formula CD6 is the magic potion!
Ektachrome and the like work by having the color couplers built in to the layers in the film and the dyes are formed all at once as products of the second developer. The magic potion in this case is Kodak's CD3. What totally fascinates me is how the color developer reacts to the three color couplers to get the correct exact dye formation in each layer!
A long time ago I posted the link to the operaton manual of the K-Lab Kodachrome processor, which explains the processing in depth. I'll find it and re-post it here.
Edit: Here's the original thread (thread? it had zero replies) which includes the links:
http://www.rangefinderforum.com/forums/showthread.php?t=12623