Stupid question about tri-color

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EASmithV

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Alrighty. Say I shoot three 4x5 negatives. One through a Green, Red, and Blue filter. I then take these images, contact print them onto halftone film. I take the corresponding contact prints/slides and then dye them red, green, and blue, with respective to the filter used. I take these three dyed clear positives, overlay them perfectly, and... Will it make a color positive?
 

erikg

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You'll want cyan, magenta, and yellow dye. If curious, look up the dye transfer process, it should answer your questions.
 

Photo Engineer

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Yes. It works. In fact there is a pseudo Kodachrome process in which you can use couplers to get positive dye images and by laminating the 3 images you have, in effect, a real Kodachrome.

PE
 
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EASmithV

EASmithV

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Yes. It works. In fact there is a pseudo Kodachrome process in which you can use couplers to get positive dye images and by laminating the 3 images you have, in effect, a real Kodachrome.

PE

I'm probably going to get in way over my head, but in laymans terms, how would one make the dye copulers, and how would they function?
 

Photo Engineer

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The process uses 3 color developers with 3 color couplers. These chemicals are outlined in a number of books, patents and also were sold by Kodak for those doing the Kodachrome process. I have posted generic structures here before, but if you want me to, I can look them up again.

There is a C, M and Y coupler set and the cyan is normally a 4 chloro phenol, the magenta is normally a pyrazolone and the yellow is an aceto-acetate.

PE
 
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EASmithV

EASmithV

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Are there people that regularly create their own Kodachromes, or is it more of an idea?

And where did you post it? In a topic, or as an article?
 

Photo Engineer

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The idea is well known and was the basis for making single color test coatings of Kodachrome. It was published in a textbook on color photography in the 40s by Leadly and Stegmeyer. It was the basis for early color processes and is used to demonstrate Kodachrome.

I did not originate this. I am aware, quite aware of it having been done by many since the days of Mannes and Godowsky. They refined it to make a tripack coated as one film and that is their contribution.

Early examples were exposed in a 3 color camera, and developed to yield a positive 3 color image.

PE
 

pnance

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In the printing industry, the halftone screens are rotated differently so the dots don't overlay each other.
 

numnutz

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Here is someone that has done tri-color, the site is in French but a Google translation is here:

http://translate.google.com/transla...t-trichromie.html&sl=fr&tl=en&history_state0=

Original French Page:
http://www.galerie-photo.com/test-trichromie.html

Instructions on how to make Autotype Trichrome Carbro prints (including recipes) + other methods to reproduce colour:
http://www.oldandsold.com/articles21/color-photography-3.shtml

or you can try 3 layer Gum Bichromate prints as here:
http://www.alternativephotography.com/articles/art121.html

I think that all the processes are somewhat difficult to do in a home darkroom except the gum bichromate the problem is achieving an acceptable color balance.


nn :smile:
 

removed account4

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you could shoot the film with the cmy filters
and send the film off to dr5 and have chromes made from your film
and then dye them, and stack them if it would save you the half tone step.

have fun
john
 
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