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Graphic 22 film flatness

 
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45PSS



Joined: 28 Sep 2001
Posts: 3209
Location: Mid Peninsula, Ca.

PostPosted: Wed Jan 25, 2012 9:31 pm    Post subject: Graphic 22 film flatness Reply with quote

The attached images were made using a unmodified Graphic 22 on a Super Speed Graphic. Film is TMY 2 processed in HC110 dilution H at 68 degrees. Scanned on an Epson flatbed at 3200dpi, resized in CS2 to 150dpi and canvas adjusted for merging in channels. The color merge has a saturation boost. The alignment is based on the center of the blossom. You are free to copy and play with them in your image editing program if you wish.

B&W


Red channel


Green channel


Blue channel


Merged color


Uploaded with ImageShack.us
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Last edited by 45PSS on Fri Jan 27, 2012 12:51 am; edited 1 time in total
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1banjo



Joined: 16 Nov 2008
Posts: 478
Location: kansas

PostPosted: Thu Jan 26, 2012 8:49 pm    Post subject: Reply with quote

I don't like what I am gitting here on my end is it in color
if so maybe I need to adjust my monter!?!?
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Dan Fromm



Joined: 14 May 2001
Posts: 1883
Location: New Jersey

PostPosted: Thu Jan 26, 2012 10:31 pm    Post subject: Reply with quote

Charles, are those scans of three b/w shots or three scans of the same frame?
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45PSS



Joined: 28 Sep 2001
Posts: 3209
Location: Mid Peninsula, Ca.

PostPosted: Fri Jan 27, 2012 12:33 am    Post subject: Reply with quote

1. B&W: total B&W shot and scan
2. Red channel: B&W shot with a #25 red filter, 16 bit grayscale scan.
3. Green channel: B&W shot with a X1 green filter, 16 bit grayscale scan.
4. Blue channel: B&W shot with a Kodak 5400K blue filter, 16 grayscale scan.
5. Tri color merger of RGB images above. The B&W is for reference.
http://photo-utopia.blogspot.com/2007_12_02_archive.html

Tripod mounted camera, probably my 100mm WFE with the filter(s) held in front of the lens.

4 scans total, 3 combined to make the 5th image. 3 copies of the same image will give a B&W composite.
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Dan Fromm



Joined: 14 May 2001
Posts: 1883
Location: New Jersey

PostPosted: Fri Jan 27, 2012 1:11 am    Post subject: Reply with quote

Thanks for the explanation.

So you're doing trichromy. Are you acquainted with what Henri Gaud has been doing along those lines?

I think, could be mistaken, he's shown some still lives shot on 4x5 with the same sort of less than perfect registration.
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45PSS



Joined: 28 Sep 2001
Posts: 3209
Location: Mid Peninsula, Ca.

PostPosted: Fri Jan 27, 2012 2:06 am    Post subject: Reply with quote

Quote:
Are you acquainted with what Henri Gaud has been doing along those lines?

No, I'm not.

Click on my www tab and look at Heirloom Tomato 2 and 3 for examples where the film was flat. The sun was at a lower angle during #3 exposures (2pm-3pm) and more stationary in #2's exposures (11am-1pm)
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Dan Fromm



Joined: 14 May 2001
Posts: 1883
Location: New Jersey

PostPosted: Fri Jan 27, 2012 2:32 am    Post subject: Reply with quote

45PSS wrote:
Quote:
Are you acquainted with what Henri Gaud has been doing along those lines?

No, I'm not.

Well, then, take a look at this: http://trichromie.free.fr/trichromie/

You may want to use Google Translate on it.
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Henry



Joined: 09 May 2001
Posts: 1439
Location: Allentown, Pennsylvania

PostPosted: Fri Jan 27, 2012 5:06 pm    Post subject: Reply with quote

Interesting, but it's no match for Kodachrome (r.i.p.), although surely that wasn't the intention.
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45PSS



Joined: 28 Sep 2001
Posts: 3209
Location: Mid Peninsula, Ca.

PostPosted: Fri Jan 27, 2012 11:31 pm    Post subject: Reply with quote

It was just a "what if" or "how well will this work" experiment.
No matter how one adjust any one of the channels all 3 will not match due to film not being flat. I made certain the camera and film holder did not move.

The www tomato (my www tab) images were made with the same Graphic 22 after a .010 addition to the pressure plate. I found 3 filters out of an older version of http://www.scientificsonline.com/better-grade-transparent-color-filters.html 3x5 size and cut them to fit some gel holders that I have that are close to the Tricolor separation of 25A Red, 47 Blue, and 58 Green Wratten filters.

http://www.karmalimbo.com/aro/pics/filters/transmision%20of%20wratten%20filters.pdf
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