Tri-color process? How to?

hey,

So I've been searching for a while, but haven't found anything useful, just lots of photoshop people :/

How does this process work? Bw negs, color paper and heavy filtration?

Super beginner, but I'm interested in the process as I like the images, and would also appreciate being able to print rom my bw negs. Have looked into gum printing, but it's hard to get materials at the moment...

hi crumpet8
it is panchromatic black and white film
using #25 Red, #58 Green, and #47 Blue filters
and then printing the resulting negatives on color paper in the dark.
here's some info: http://www.largeformatphotography.info/forum/showthread.php?105362-Trichromatic-Photography
i don't do color work but i will make trichromes using modern methods. its lots of fun !
but i am sure pin registering separation negatives in the dark and printing them on color paper is a lot of fun too.

maybe dan fromm will chime in, i know he visits the french trichrome website...

john

IF you feel like getting complicated at some future time, , this guy is doing some fascinating stuff (there was a url link here which no longer exists)

[QUOTE="jnanian, post: 1891498, member:.

maybe dan fromm will chime in, i know he visits the french trichrome website...

john[/QUOTE]

Thanks, that's a good start I still don't understand how the film/filtering works though. The filters are used when shooting? Or when printing? Or both?

yep, I've been to the French site, but my google translate wasn't very good on the iPad. Have to check it out on the computer later...

Pdeeh - thanks! That print he made is amazing will look into that process too

crumpet8

the filters are used when exposing the film
you get "color separation negatives"

then, you either print them onto color paper or import them into your electronic machine ...
and stack them in color channels.
denise ross over at the light farm is using 3 different self made photo emulsions to do her tri chrome image making. lots of fun !

What is that camera which has three plates, filters for each, and uses mirrors to expose them all simultaneously?

Theo Sulphate said:

What is that camera which has three plates, filters for each, and uses mirrors to expose them all simultaneously?

Click to expand...

I am in over my head here but years ago there were several "one shot" color cameras that did what you described using b&w film in sheet film holders. One was the Curtis "one-shot" color camera. It was my understanding that after processing the b&w films, they were treated as color separation negatives and each exposed "in registration" through probably the same filters on to dye transfer paper. You now know everything I know about "one-shot" color cameras and I am not even sure if this information is correct. I do know that there was a Curtis one-shot color camera. Wikipedia probably has a write-up on such equipment.......Regards!

national fotocolor used to make one too.
the russian photographer Sergei Mikhailovich Prokudin-Gorskii used something similar but with glass plates
to make something like magic lantern slides that he projected ... like one of those wide screen TVs from the 70s/80s
http://archive.boston.com/bigpicture/2010/08/russia_in_color_a_century_ago.html

crumpet8 said:

Thanks, that's a good start I still don't understand how the film/filtering works though. The filters are used when shooting? Or when printing? Or both?

yep, I've been to the French site, but my google translate wasn't very good on the iPad. Have to check it out on the computer later...

Pdeeh - thanks! That print he made is amazing will look into that process too

Click to expand...

Hello,

Henri is a friend of mine and maybe I can be of some help.

First you need to get your separated negs. It may be done in two ways. Using your usual camera or a one shoot three holders camera.

In the first case you take three pictures of your subject. Each one with a different filter (RGB) and get a time parallax. In the second, the filters are inside the camera and a beam separator splits the image in three images. Two of them will be "doubled".

When you have those three negs, the rest maybe purely analog like it was written above (pin registration and so on) or digital.

Digital, you have to know witch neg is witch... and convert them in layers of the new image and convert the image in color and... Taadaaa.

The best thing you can do is to drop him a line directly. He will help you.

henrigaud@editionsgaud.com

J

Thanks, it's late here so I'll get back to you shortly.

ventdesable said:

Hello,

Henri is a friend of mine and maybe I can be of some help.

First you need to get your separated negs. It may be done in two ways. Using your usual camera or a one shoot three holders camera.


henrigaud@editionsgaud.com

J

Click to expand...

What is the process after? I have some ra4 paper and chemicals, is it just a matter of enlarging the three negs onto the paper? Can I use a bw enlarger for this? Also, seeing as its three negatives sandwiched should I shoot or develop thinner negatives?

Well your can do it with your usual tools.
B&W enlarger with same color filter and a positioning tool (you also enlarge errors...).

As I wrote above ; the best is to send him an email and he will give you an helpful hand.
Or... you can learn French and read his PDF. Every thing is exposed in it.

http://trichromie.free.fr/trichromie/index.php?post/2015/11/23/PDF2015

Bonne Journée

Jérôme

Carbon 3 Color on Belgium
Book - Stage - Carbon with Ag+ sheet film, noting inkjet printing, all is Carbon 3 Color

http://www.philippeberger.net/fr/page_7111.html