The Pigment Processes - Photographic Processes Series - Chapter 8 of 12발음듣기
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The Pigment Processes - Photographic Processes Series - Chapter 8 of 12
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The Pigment Processes - Photographic Processes Series - Chapter 8 of 12
One of the major themes in photography is this desire to have a more permanent image.
You have the Woodbury type.
You have the platinum print.
Very stable, very long lasting processes.
Then you also have the pigment family of processes.
The gum dichromate process and the carbon print process.
The gum print is based on the light sensitivity of chromium.
Mungo Pontoon is the first person to really do experiments with the light sensitivity of this compound.
Talbot himself experiments with chromium salts.
He discovers that if you mix them with colloids gelatin or gum they harden when they are exposed to sunlight.
Based on the work of Talbot it doesn’t take too much time for people to figure out that if we take a colloid like gum Arabic.
And we put pigment into those, and then sensitize those with chromium salts we now have a medium that can brushed onto paper expose it to light under a negative.
And when we put this paper in warm water areas that are struck by light will harden, and that’s where the dark pigment will be.
Areas that are not struck by light will dissolve away, leaving the white of the paper.
So now we have a brand new printing process, based on chromium.
If you look at a gum print, the darker the picture, the thicker the deposit of gum.
The whiter the picture, the more you are getting towards the actual paper.
So the image itself will have slight relief.
One of the names associated with gum printing and carbon printing is Alphonse Poi Tevin.
He is a Frenchman who perfects certain elements of chromium printing.
While it is still imperfect, it is the seed to an improvement that is later done by Joseph Swan that results in the process we now call carbon printing.
It is essentially a piece of paper that is coated with gelatin that is bearing pigment.
This thing is called the “tissue” but it is not tissue like at all, it’s like a piece of plastic.
The tissue is sensitized with chromium.
It is then contacted printed with a negative.
The light striking the gelatin hardens it selectively.
The tissue is then put into cold water, and a second piece of paper bearing clear gelatin on the surface is put into contact with the tissue.
They are slid into a tray with hot water.
The unhardened gelatin with pigment oozes out the edges.
It is softening because of the hot water.
You peal off the original tissue, and by washing it in hot water you take away all the black you don’t need in order to get a continuous tone photograph.
The image you get is very permanent.
It is still being done today, there are still people making carbon prints today.
Pictorialists really established photography as a fine art form.
They used things like the gum dichromate process or platinum prints that involved a lot of hand work and craftsmanship.
You really had a sense of the photographic object as something that was made by somebody.
Alfred Stieglitz is the person most associated with what was called the photo-secession.
He and Edward Steichen co-founded the movement.
They promoted this idea through a publication called Camera Work.
Stieglitz had a gallery called 291 in New York that showed photography as an art form.
This was a camera that was used by Alfred Stieglitz.
It was given to the museum by Georgia O’Keeffe in the 1950’s.
The opening of that lens determines the sharpness of the picture.
If you open it up quite a ways, you get an image that is soft around the edges.
He was interested in Pictorialists photography, and this was the lens designed to do that.
Stieglitz, Steichen, and Kasebier wanted people to take photography seriously as a fine art form.
Not just an automatic activity that produced images without anybody’s intervention.
I think what the argument was really about was where is the creative input of the artist in photography.
That is a theme that goes back to the invention of the medium.
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Mungo Pontoon is the first person to really do experiments with the light sensitivity of this compound.발음듣기
대기중
He discovers that if you mix them with colloids gelatin or gum they harden when they are exposed to sunlight.발음듣기
대기중
Based on the work of Talbot it doesn’t take too much time for people to figure out that if we take a colloid like gum Arabic.발음듣기
대기중
And we put pigment into those, and then sensitize those with chromium salts we now have a medium that can brushed onto paper expose it to light under a negative.발음듣기
대기중
And when we put this paper in warm water areas that are struck by light will harden, and that’s where the dark pigment will be.발음듣기
대기중
While it is still imperfect, it is the seed to an improvement that is later done by Joseph Swan that results in the process we now call carbon printing.발음듣기
대기중
This thing is called the “tissue” but it is not tissue like at all, it’s like a piece of plastic.발음듣기
대기중
The tissue is then put into cold water, and a second piece of paper bearing clear gelatin on the surface is put into contact with the tissue.발음듣기
대기중
You peal off the original tissue, and by washing it in hot water you take away all the black you don’t need in order to get a continuous tone photograph.발음듣기
대기중
They used things like the gum dichromate process or platinum prints that involved a lot of hand work and craftsmanship.발음듣기
대기중
Stieglitz, Steichen, and Kasebier wanted people to take photography seriously as a fine art form.발음듣기
대기중
I think what the argument was really about was where is the creative input of the artist in photography.발음듣기
대기중
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