There was a three color gelatin gum process, (non silver except for the
negitives), that used three b&w images made with the proper filtration.
The gel prints had to be floated off their backing onto a new
substrate. It wasn't difficult in theory but a PITA in practice. I
think it was invented sometime in the 1800's. It would produce a soft
(as in focus), pastel color print if you did /everything/ right. Now
I'm working from memory here, I haven't seen the book I got this from in
quite some time. I tried googling and came up with this. No examples
though.
http://tinyurl.com/mobsa8
John Sessoms wrote:
From: Scott Loveless
On 9/3/09, Graydon <[email protected]> wrote:
> On Thu, Sep 03, 2009 at 08:54:58PM -0400, Desjardins, Steve scripsit:
>
> > I didn't realize they could do color that well back then.
>
>
> Arguably, they couldn't; it was a three-sequential-negatives process,
> and really tough to put back together chemically to get a colour
image.
>
> If I'm following the various articles correctly, many of the
images now
> available were not available at the time; digital recombination
is much
> easier and the Library of Congress had all the possible ones done.
I thought it was 3 monochrome positives projected through 3 separate
filters. Red, green and blue, or something like that. And that
getting the projectors set up properly was the hard part. Or maybe
I'm smoking crack again.
The Library of Congress server was down for maintenance last night, so
I couldn't see what they had to say until this morning.
It looks like he displayed his color images using the magic lantern
process you describe, but didn't print them in color. The reference
prints shown by Library of Congress are black & white.
There's a link to "Making Color Images from ..." that shows a camera
similar to the one he used and a projector for projecting the images.
http://www.loc.gov/exhibits/empire/making.html
Found another set here searching for "digichromatography"
http://www.gridenko.com/pg1/index.htm
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