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Author Topic: 200 hours times 1.000 aerial photos per hour  (Read 4655 times)
Johan_Ahlen
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« on: August 20, 2007, 05:34:25 AM »

Friends!
Here is a brother who has acquired a vast photo archive with  great cultural and economic potential.
Rolls and rolls of black n’white aerial photographs picturing country farms from the years 1950 through 1957 (that’s when they went color). And it’s solely from the country of Sweden.
But the issue, and the questions that arise may be of “global” interest.
We are talking big negatives,  90 x 70 mm each, in rolls of 50 (makes 5 meter rolls) neatly locked up in hand soldered metal cans of German origin. Film brand is Aviphot. (Gevaert).
The archive consists of some 3.700 of these cans which makes up for slightly under 200.000 images (there are some additional material in there also, about 15.000 post card negs).
That many farms should represent a good portion, if not a majority, of all farms in Sweden at the time. And my ambition is to put the whole lot on the internet. Smart eh?
I reckon people would want to buy photos, pictures for the wall, or digital copies. As a matter of fact I’m in the business already, doing some sales and have as of now digitized some 10.000 pics. A few hundred are on my home page (Swedish language, but give it a try: www.flygfotohistoria.se/ Click on Bilder fran hela landet, to see a list of places in Sweden.

I would like to line out my digitizing routine:
Firstly: there is NO equipment in store shelves for my 80 mm (physichal) film width. And anything driven by electric motor would have to face the fact that distances between  negs range from 0 to 15 mm.
So I have a Nikon D70s that’s hanging in a post vertically pointing at a 80 mm wide table track with a 90 x 70 mm opening beneath and over  which I pull the film frame by frame. Further down (out of focus) is a light source that gives even daylight. The camera is connected to a laptop with external hard drive and shooting is managed with a foot pedal (big toe button to be precise).
With this and naming software  (Nikon’s Camera Control Pro) I have so far managed to populate that hard drive with folders with correctly named picture files in them, at a rate of more than 1.000 pictures an hour. So it’s a 200 hour job you may argue. Well not quite. Some rolls are cut up in sections, they can often be rolled up backwards (starting with picture no 50) and little nicks and nacks that you just stumble on. Plus that I wouldn’t put even my enemy at such a tedious work. I am heading for a few hours a day aiming at having reached the end before coming Christmas (I need to do some sales also not to forget).
Batch conversion is a key issue here. Each pic needs to be cropped, rotated, inverted and watermarked  + IPTC tagged. I use GraphicConverter  6.0 and iWatermark for that purpose. File name changes are very swift in File List. I rely on a 15” PowerBook + extra screen.
All this said I simply want to share my joy over this project with you out there. I have a copy of the DAM book and it’s given me great confidence to proceed. I still don’t know if I’m stupid not setting the Nikon to NEF RAW, it runs quicker at JPEG levels that are good for the net,  and orders I do by hand anyway.  The D70s gives 14 meg TIFFs to work on which is maybe in the lower order for photos up to a half meter widths. A 10 megapixel camera maybe would work fast enough (less than three seconds between shots)  plus give print width. My web page will be MySQL fitted later this fall. So my consultant tells/advices me. Comments?
Also: Each roll is numbered and the same numbers appear on maps that come with the films. It seems I have no competition with the 1950:s material. At least none is older. But I can’t afford to hesitate. The kids in the pictures, with a hand over their forehead, are now coming of age. Some even remembering the airplane.
I work alone but I like to share my experience. I suppose this is a good place to do so.
Johan Ahlén
Sweden
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Johan Ahln
Aerial photographs of Sweden 1946 through 1964. All black n white
peterkrogh
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« Reply #1 on: August 20, 2007, 09:14:44 AM »

Johan,
Hey, this is a pretty cool project. 
We're 25,000 or so images into a project like this for my personal B&W archive, so I have some idea what you are going through.

I would say that you should consider doing this in Raw, and using a higher resolution camera (D80 would probably work fine).  I have posted a movie showing how we do convert to positive with RapidFixer CS3, and it is working quite well.

http://damuseful.com/movies/RapidFixerCS3.mov

Do you have data on where the pictures are posted?  If so, how are you attaching that to the images?

Peter
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peterkrogh
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« Reply #2 on: August 20, 2007, 10:26:57 AM »

Johan,
Are you sure your lightsource is even?  I took anotehr look at your images, and I see the image getting lighter on the left side, and tere appears to be a dark line running down the right side a bit inside the right edge.

As I have been setting up for Camera Scans, I do the following:

• Shoot a picture of the neg
• Pull the neg and place it upside sdown in the neg carrier
• Shoot a second photo
• Open in both images in Photoshop
• Paste the image from one file into the other
• Rotate
• Use the Auto Align in CS3
• Toggle visibility between the two layers

If there is a brightness difference in any part of the file,  readjust the lights so that it is more even.  After three tries or so,  get the light even enough to work with.
Peter
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Johan_Ahlen
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« Reply #3 on: August 21, 2007, 06:28:19 AM »

Thank you Peter for prompt and valuable answer(s).
Let me congratulate you straight away for your DAM book. It is a very ambitious and useful undertaking you’ve done. It will be a handy companion for lots of people for many years to come. Me, for one.
Thanks for the movie on RapidFixer. When it comes to proofing I overlook every roll of 50 pics before publishing and usually give them all the same treatment since they often “suffer” from the same conditions. I do that in Graphic Converter that has a batch function better than Elements, but not as neat as your RapidFixer. I will have to consider getting CS3.
Your question about data on where the pictures are posted, I don’t quite understand. Can you clarify the question?
About the backlight – I’m glad you notice. I have a quite small 24 x 18 cm light source fixed as far down under the film as possible, to be out of focus. Light at the edges probably spills out since I don’t have a shaft – like a funnel shaped room with white walls - to confine the light. Making such an arrangement plus raising the light a bit would probably make for a stronger and hopefully steadier light area. I was advised to get a flash (Elinchrome) but went for this simpler way instead. Could be that I’m wrong. I have tried some different setups though, over my weeks of digitizing, resulting in slightly different picture status. Plus that the films themselves vary.
Thanks for the tip on calibrating. It would be smarter to get a more high-end light source though, than to try to adjust this little gadget. I suppose just taking a picture without any negative on the table and then underexpose the image would tell what corners and parts of the area are uneven.
Your’s best for now
Johan Ahlén
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Johan Ahln
Aerial photographs of Sweden 1946 through 1964. All black n white
peterkrogh
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« Reply #4 on: August 21, 2007, 11:02:22 AM »

Johan,
Evenness of the light source can be achieved by the use of diffusers, which you can make pretty cheaply out of material from a movie lighting shop.  Rolux is the name of one kind of sheet material that you could use.  You might want several layers.  Flash is only necessary if you need the additional light to reduce exposure time because you are getting camera shake, or you want a smaller aperture.  Keep in mind that very small apertures produce a less sharp image due to light diffraction.

As to the question about location, I was asking about the location where the photos were taken - where the farms are.  Is there some kind of data sheet that lets you know where the photos were shot?
Peter
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Jan Willems
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« Reply #5 on: October 11, 2007, 03:17:13 AM »

Verwijderd
« Last Edit: October 29, 2007, 05:46:50 AM by Vogan Gaudo » Logged
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