[PRCo] Re: FARTHER OFF TOPIC (COLOR FILM PROCESSES)

[Fred Schneider]

Tell me more about your photographic interests directed to me and not to Derrick.  We don't need to bore everyone.  You might want to copy everything also to Ken Josephson because he is getting in a little deeper than some others ... he has a 4x5 Graphic that he wants to learn to use.

I should add (briefly) that I am the third generation in the Schneider family that has dabbled in photography.  I'm working now with 4 Nikons, 2 Mamiya's, 1 Hassalblad, 1 4x5 view camera, 1 graphic with a flat field lens for copy work, and four enlargers from 6x6 up to 5x7 in an 18 x 28 foot darkroom.  That much said ... we can let only those who are interested ask to get in on this topic.

hwandrews1 at cs.com wrote:

> Fred,
>
> Fred - the process you discribed that you father used was, I think, called tri-color photography.  It is based upon the 3 primary (red, green and blue) colors.  And you right, technicolor was shot on a special camera that did the 3 color seperation in the camera and exposed 3 rolls of B&W film.  When they did the release films the dyes were added based upon the density of the B&W master.
>
> The dye transfer process is a method of printing images.  Kodak use to market everything you needed to do this - but I haven't see it in years.  Basically with Dye Transfer you made 3 gelatin masters, one for each primary color, then 'transfer' subtractive dyes (cyan, magenta and yellow) to the carrier paper.
>
> Today most of the the color film is what's called 'chromagenic' - that is the dyes are formed in the emulsion when the image is developed.  That's why most of them are not archival - i.e., they do fade over time.  The one exception is Kodachrome - it is really a 3 layer B&W film and the dyes are added during processing.  That's way Kodachrome has such rich colors - and is so darn expensive!  It is also the most archival film you can buy.
>
> Had to add my 2 cents - photography is one of my many interests.
-- Trailing quotes stripped by Listar --