#16
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I used a "levels" correction layer and clicked on the background of the Bisquick set with the "gray" eyedropper. This over-exposed the slides a bit, so I added a lower (preceding) levels adjustment layer to bring down the levels so the highlights were not overexposed/clipped. I then added a hue/saturation adjustment layer on the top of the stack and adjusted the hue by 20 degrees, which may be a little too much. However, because of film characteristics, it may be impossible to get exactly correct results in the highlights as well as the mid tones. The Doublemint and Couple images seemed to especially need the first over-all level adjustment, as they appear a bit over-exposed and washed out to start with.
The color blockiness in the original scans due to the jpeg compression was emphasized in the yellow when I made the hue adjustment. This is because the Photoshop hue adjustment rotates the proportions of red, green, and blue, which means the brightness also changes when the hue is changed. Maybe working in Lab space instead of RGB space would fix this - I haven't tried it. Please feel free to use these images on your site. Last edited by old_tv_nut; 12-21-2016 at 10:32 AM. |
#17
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Kodachrome doesn't do that sort of fading. Its Ektachrome that does.
And for correct correction you can't just hue rotate in Photoshop. You have to mix the R, B, and G channels, some with + signs and some with - signs. This is, if I remember correctly, "Channels". I've succeeded twice doing this, both with very valuable slides (one being the only photo of the only eruption ever of one "pool" in the Yellowstone geyser basins, in the 1950's grest earthquake.) It was painfully hard ... took hours due to inexperience, which I have long since lost. |
#18
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Thank you for the permission.
__________________
Personal website dedicated to Vintage Television https://visions4netjournal.com |
#19
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FWIW, my Great-Grandmother died back in September, and we found that her Kotavachrome prints from immediately after WWII through 1953 are quite faded. My Grandmother's wedding photos (also on Kotavachrome, this time circa 1957) are fine. Does anyone know what Kodachrome chemistry was in use circa 1951?, when the Life magazine slides were shot? It's much too early for K-14. Maybe K-12? Last edited by benman94; 12-22-2016 at 01:19 PM. |
#20
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All the Kodachrome that I have personally handled did not fade this way, even stuff shot by my father in the early 50's. So, I'm thinking that while some earlier Kodachrome may have faded, any used in 1951 probably did not. I would love to see some dated examples from 1951 that prove or disprove this. The later versions of Kodachrome for sure had excellent dark stability, but actually poorer light stability than Ektachrome. We had to make duplicate test slides for the Zenith lab because using them daily in a slide projector / vidicon telecine for TV test material would produce noticeable fading (and mostly neutral, not towards pink) within a week. Fresh duplicates would be used for critical one-time/final video tests. Slides could be used in a flying spot scanner for long periods without fading, but the only use of a FSS was in the video disk lab, not for TV development. Plus, I don't believe the FSS had an automatic slide changer. |
Audiokarma |
#21
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Our 16mm home movies are in fine shape, having been projected only a handful of times. They do have truly excellent dark stability. My Great-Grandfather even coughed up the dough for a little RCA sound-on-film camera. The audio quality is terrible, but it is neat seeing amateur motion pictures with sound from a man who died in 1971. |
#22
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Something to take note of: the Viewmaster 3D transparencies were Kodachrome dupes, and even the early ones did not fade. Not sure if there might have been a later period when they would have, or if manufacture was curtailed during the same time (WWII). So, this fading Kodachrome may be a case of a period when development chemistry was being modified, was still compatible with the same version of the film, but resulted in dies that were less stable for a particular version of the chemistry.
Viewmaster much later went to Ektachrome or other similar processes (especially as it was used more and more as a cartoon toy rather than travel pictures), and did suffer from pink fading. Jack Coote, in The Illustrated History of Color Photography, mentions that Kodachrome II (process K12) introduced in 1961, had improved sharpness, grain, and permanence; but he doesn't say anything about variations in the earlier process after 1938. He also says that the Kodachrome print processes were: Minicolor: 2 1/4 x 3 1/4 or 5 x 7 1/2; Kotavachrome: any size from 8x10 to 30x40, and used a contrast mask to improve image quality. He says that these prints were not made after 1946, but similar prints dubbed Kodachrome Prints were made until 1955. |
#23
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The Permanence and Care of Color Photographs (by Wilhelm and Brower, 1993) says that the early version of Kodachrome, used from 1935 to about 1940, used a controlled-diffusion bleach development, and had poorer dark stability. They show an example from 1939 that has faded toward magenta, and has almost no yellow dye. They say the later selective exposure development process introduced in 1938 had excellent dark stability. They also say that both Kodachrome based print processes had excellent dark stability. After 1955, the name Kodachrome print was still used, but the print process was done via a Kodacolor type of internegative and negative printing paper, so stability was no better than color negative prints.
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#24
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Is it possible that the dyes just aren't as stable as perhaps they were once thought to be? If you noticed a badly faded slide from 1939 in 1993 (54 years elapsed time) it's not really a stretch to imagine that someone (such as myself) could find Kodachrome photographs from 1947 or so to 1953 that are faded now, in 2016.
If I had to make a wild ass guess as to why I have faded Kodachrome, I'd say it's more likely an issue of quality control. Kodachrome, in any of the iterations, was a very difficult film to properly develop. I've spoken to a retired chemist from Kodak who said they LOATHED working on experimental Kodachrome film because someone would have to attempt, usually in vain, to develop small batches by hand. My understanding is that Kodachrome development for the masses was done with large machines in regional Kodak facilities. These machines had electromechanical and electronic timers to control the various stages. Couple the possibility of a timer failure with a bad batch of some chemical, and a notoriously exacting devlopment process, and you could theoretically wind up with a group of less stable slides or prints. No process being done on an industrial type scale is going to be done perfectly, one hundred percent of the time... |
#25
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Difficulty in quality control is a very reasonable speculation. Unlike later color films, in which the stages after development were driven to completion, Kodachrome had multiple stages in which hypothetically one layer could be driven to completion at a time, but practically they could not because the process would start to affect other stages. The last Kodachrome I shot and had developed at Dwayne's (for comparison to digital) has always looked to me like not all the silver was removed, although I can't prove it.
However, improper processing of film usually results in staining over time from residual chemicals rather than fading of one dye layer compared to the others. It's hard to imagine a mistake that would selectively affect the life of just one or two dye layers, but maybe. Question: how are the blacks in your images? If they are still black and not colored, that indicates staining rather than dye fading. |
Audiokarma |
#26
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I too think it would be odd to have a color film with fading in only a single layer, but as you aluded to, Kodachrome is essentially just three black and white emulsions, each sensitive to a different portion of the visible spectrum, and stacked. I can't see quality control being an issue during manufacture; the film is just too simple. Edit: I actually can think of a QC issue in manufacture that could cause what might LOOK like fading. If one of the three emulsions was mixed improperly, you could end up with a situation in which the record for that layer isn't "contrasty" enough compared to the other two. The processing would then continue normally, but the dye layer for the emulsion with the defect would be "weak" by comparison. The slide would look faded right out of the box, and any subsequent prints (like the Kotavachrome prints) would look the same. Now I wish I could go back to 1953 and see the slides when they were new. I can see Kodachrome being more likely to have layer-specific QC issues during development than say Ektachrome or Fujichrome with the integral dye couplers. Last edited by benman94; 12-22-2016 at 12:06 PM. |
#27
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So, it's definitely dye fading.
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Since the color-determining part of the reaction is in the Kodachrome developers and is different for each layer, the thing that makes most sense to cause a fading problem is that they changed the chemistry of the dye forming for one or more of the layers, not in the film, but in the processing, producing a less stable dye. In the case of all the other Ektachromes, Kodacolor, etc., the color-determining part is in the film and a common reactant is in the color developer. Therefore, the differences of composition of each dye is baked into the film rather than the developing solution. But, bad dyes could be created by either method. It's just very hard to find documentation of variants of Kodachrome chemistry, whereas Ektachrome and its cousins as well as color negative process shortcomings over the years are illustrated and bemoaned in books on process history and preservation. The loudest weeping and gnashing of teeth involves the Eastmacolor negative/print processes for movies that have often dark-faded to where restoration is nearly impossible. Last edited by old_tv_nut; 12-22-2016 at 06:39 PM. |
#28
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You're right of course. In my mind, I was thinking extreme fading due to a QC issue from development. You would expect it, at least in an E-6 process slide (or something similar) to effect more than one layer. It's been a long day...
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#29
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Last edited by benman94; 12-22-2016 at 08:17 PM. |
#30
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Interesting - but I can't believe that any variations you are seeing in Ektar100 are as bad as your faded prints from 1951. Please tell me it isn't!
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Audiokarma |
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