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View Full Version : Can trichrome Autochrome be on color film and suitable film / filter matching



Mustafa Umut Sarac
03-29-2011, 10:25 AM
As you know , I had been posted the original Autochrome RGB Spectrums. I am thinking to order a filter set from labs specially made for match the colors of Autochrome.

It will be a trichrome process.

I am looking for someone - May be Ron can do it , I dont know yet - to draw the curves of each filter with including bw or color film sensivity . Who can do it and what cost ?

Can filter guys can do it ?

Second , can trichrome photography could be done with color film , is it suitable for that ?

Thank you ,

Umut

Bob Carnie
03-29-2011, 11:02 AM
If I am not mistaken Dinesh was talking about this the other day, I will see what he thinks.


As you know , I had been posted the original Autochrome RGB Spectrums. I am thinking to order a filter set from labs specially made for match the colors of Autochrome.

It will be a trichrome process.

I am looking for someone - May be Ron can do it , I dont know yet - to draw the curves of each filter with including bw or color film sensivity . Who can do it and what cost ?

Can filter guys can do it ?

Second , can trichrome photography could be done with color film , is it suitable for that ?

Thank you ,

Umut

holmburgers
03-29-2011, 12:02 PM
What exactly do you mean by using color film?

Mustafa Umut Sarac
03-29-2011, 12:05 PM
What do you mean with asking What exactly do I mean by using color film?

holmburgers
03-29-2011, 12:07 PM
I mean, what exactly is the purpose of color film in the autochrome? Will it be used behind the screen, as the recording emulsion? That's what I mean.

Mustafa Umut Sarac
03-29-2011, 01:07 PM
Read my post again.

holmburgers
03-29-2011, 01:32 PM
Yes Umut, of course I've read it.

You ask, "Second , can trichrome photography could be done with color film , is it suitable for that ?". That's a rather open ended question. I mean, for one, it already is trichrome photography. Do you mean utilizing the color film as the screen-plate emulsion? Do you mean making filters with color film? Do you mean making 3 separate exposures through filters onto 1 sheet of color film?

Mustafa Umut Sarac
03-29-2011, 01:44 PM
Let me try to explain again. I want to reach the most perfect possible color mixture with ordering or making 3 different colored color filters. R , G and B for each filter.
Problem

I have posted commercial RGB filters spectrums and autochrome screen spectrums and they were different.

Solution ;

is to order special spectrum filters from astronomy or remote sensing filter supplier.

Problem ,

Whatever you do with these filters , modern film emulsions do not match.

Solution ,

is to engineer these filters to modern emulsions.

Problem

is it possible or color films works better.

Here we came to my point.

Umut

Gerald C Koch
03-29-2011, 02:20 PM
Hard to determine what you are intending to do.

The Lumiere Autochrome system did not use color film but a standard BW emulsion. It is amazing that it worked at all for the emulsions were only blue sensitive. So far it seems no one has been able to duplicate this process.

holmburgers
03-29-2011, 02:53 PM
It is amazing that it worked at all for the emulsions were only blue sensitive. .

That's not the case, it was most certainly panchromatic, save for some small deficiencies in the red.

Mustafa Umut Sarac
03-29-2011, 03:13 PM
I think there is big problem at my english :) But I suspect anyone says he she is using shakespeare english at forums.

to think in Turkish , to write in english.
thats the problem

Umut

holmburgers
03-29-2011, 03:37 PM
I'll try to tone down my superfluity . . . hehehe.

By "save for..." I mean "except for...".

Gerald C Koch
03-29-2011, 04:07 PM
That's not the case, it was most certainly panchromatic, save for some small deficiencies in the red.

In a way we are both correct. :) The plates released commercially in 1907 used a panchromatic emulsiom. However, earlier versions of the process used an "orthochromatic" emulsion. Just how far the sensitivity extended into the green region I don't know.

Gerald C Koch
03-29-2011, 04:14 PM
That's not the case, it was most certainly panchromatic, save for some small deficiencies in the red.

In a way we are both correct. :) The plates released commercially in 1907 used a "panchromatic" emulsiom. However, a yellow filter had to be used in front of the lens to prevent blues from becoming too light. So sensitization was rather poor.

Mustafa Umut Sarac
03-29-2011, 04:17 PM
I'll try to tone down my superfluity . . . hehehe.

superman ! wants to save the earth from kodak color films.

holmburgers
03-29-2011, 06:13 PM
Jerry, you're right about the yellow filter. Ortho is a fair assessment.

http://www.cinecon.com/frontimages/2446-superman.gif