Re: Strange old colour film
On 28/02/2014, David Mann dmann...@gmail.com wrote: On Mar 1, 2014, at 2:14 am, Mark C pdml-m...@charter.net wrote: It looks like a 3 or 4 color separation offset print so my guess would be with Paul that it is a photo of an image printed in a magazine. Is the same pattern visible if you look at the print directly under a loup? I assume it is there. If not it would probably be a scanning artifact. We had to pop into my wife's work on the way home from her mother's place to check on the leaky roof after a rain storm (it's leaking because it's undergoing repairs). I took the opportunity to bring the slide along so we could look at it under the microscope and we managed to get a photo by holding her iPhone up to the eyepiece. I was skeptical but it came out rather well. This is a crop of the full-size photo to preserve as much magnification as I can get. http://gallery.multi.net.nz/photo/779/ It's a stereo scope so I was able to see that the blue layer is at the bottom, with the green in the middle and red on top. I think the magnification is 100x (10x objective, 10x eyepiece). Plus whatever magnification I'm getting from cropping the phone pic. We couldn't get the 40x objective to focus through the glass but I don't think we needed it. The dark splotch is part of the image. You can just make out the grainy appearance (it was much sharper to the eye). The grain is present even in bright parts of the image but it's incredibly fine even under this magnification. I'm not sure what caused the bleeding between the red bits but it looks like a hair on the image. Here's a link to a smaller thumbnail where you can see that more clearly. That might give a clue to the process by which it was produced. http://gallery.multi.net.nz/img/thumbs/779-sz4pqpbs.jpg Under a 10x loupe I can only barely make out that there are separated primary colours so this detail is is incredibly fine. If it is a photo of a print then it's a really very seriously bloody sharp one. In contrast, a closeup of Polachrome: http://farm8.staticflickr.com/7262/7471683282_f914422824_m.jpg Yours looks more like a copy of a printed image, to me. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On 28/02/2014, David Mann dmann...@gmail.com wrote: Under a 10x loupe I can only barely make out that there are separated primary colours so this detail is is incredibly fine. If it is a photo of a print then it's a really very seriously bloody sharp one. Or I'll read Steve's post next and see that it's clearly Dufaycolour. I'd forgotten about that stuff. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
See if anyone here can help: www.rps.org/special-interest-groups/historical B On 28 Feb 2014, at 02:43, David Mann dmann...@gmail.com wrote: I had a reply from the camera shop: --- Our in-store committee thinks it might be a copy-neg/slide from a litho original, hence seeing all the lines from the pre-press screens used in the print process. If not that, then we’re in the dark too. --- I'm interested to know what others think. Cheers, Dave On Feb 28, 2014, at 12:27 pm, steve harley p...@paper-ape.com wrote: on 2014-02-27 14:32 David Mann wrote Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ can you post a snip at 100%? the pattern as far as i can make it out doesn't have traditional halftone angles, and appears to be RGB, rather than CMYK; this would suggest it was shot from a display or some other transmissive, rather than reflective, source; what that could have been in 1951 i have no idea - is the actual slide from 1951, or is it perhaps a repro slide shot off of a video of the original? -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
It looks like a 3 or 4 color separation offset print so my guess would be with Paul that it is a photo of an image printed in a magazine. Is the same pattern visible if you look at the print directly under a loup? I assume it is there. If not it would probably be a scanning artifact. Sounds like a fun project! Mark On 2/27/2014 4:32 PM, David Mann wrote: Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ As you can imagine it's fiendishly difficult to scan. Once I have a good scan (ie not blown out) it's quite easy to get rid of the pattern in Photoshop. Note I haven't done any colour corrections other than increasing the brightness a bit. I've had a look using a 10x loupe and it looks a bit like an LCD screen but is hard to make out at such a low magnification. I might try a higher res scan later, and I'll find out whether the microscope at my wife's work has a camera. Could anyone fill me in on what the film might be? The photo in the pic was taken in 1951. In case you're curious it's part of a photo taken at the top of Dyers Pass after a snow storm. I might post the full pic in future. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On Mar 1, 2014, at 2:14 am, Mark C pdml-m...@charter.net wrote: It looks like a 3 or 4 color separation offset print so my guess would be with Paul that it is a photo of an image printed in a magazine. Is the same pattern visible if you look at the print directly under a loup? I assume it is there. If not it would probably be a scanning artifact. We had to pop into my wife's work on the way home from her mother's place to check on the leaky roof after a rain storm (it's leaking because it's undergoing repairs). I took the opportunity to bring the slide along so we could look at it under the microscope and we managed to get a photo by holding her iPhone up to the eyepiece. I was skeptical but it came out rather well. This is a crop of the full-size photo to preserve as much magnification as I can get. http://gallery.multi.net.nz/photo/779/ It's a stereo scope so I was able to see that the blue layer is at the bottom, with the green in the middle and red on top. I think the magnification is 100x (10x objective, 10x eyepiece). Plus whatever magnification I'm getting from cropping the phone pic. We couldn't get the 40x objective to focus through the glass but I don't think we needed it. The dark splotch is part of the image. You can just make out the grainy appearance (it was much sharper to the eye). The grain is present even in bright parts of the image but it's incredibly fine even under this magnification. I'm not sure what caused the bleeding between the red bits but it looks like a hair on the image. Here's a link to a smaller thumbnail where you can see that more clearly. That might give a clue to the process by which it was produced. http://gallery.multi.net.nz/img/thumbs/779-sz4pqpbs.jpg Under a 10x loupe I can only barely make out that there are separated primary colours so this detail is is incredibly fine. If it is a photo of a print then it's a really very seriously bloody sharp one. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
Might it be a photo of an old picture post card? For what it's worth, plug this number into Google Maps: -43.606235,172.645487 ... and go to street view, looking SE. On 2/27/2014 4:57 PM, Paul Stenquist wrote: I suspect that someone photographed magazine pages. I don’t think the dot pattern is in the film. Paul On Feb 27, 2014, at 4:32 PM, David Mann dmann...@gmail.com wrote: Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ As you can imagine it's fiendishly difficult to scan. Once I have a good scan (ie not blown out) it's quite easy to get rid of the pattern in Photoshop. Note I haven't done any colour corrections other than increasing the brightness a bit. I've had a look using a 10x loupe and it looks a bit like an LCD screen but is hard to make out at such a low magnification. I might try a higher res scan later, and I'll find out whether the microscope at my wife's work has a camera. Could anyone fill me in on what the film might be? The photo in the pic was taken in 1951. In case you're curious it's part of a photo taken at the top of Dyers Pass after a snow storm. I might post the full pic in future. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
on 2014-02-28 11:37 David Mann wrote I took the opportunity to bring the slide along so we could look at it under the microscope and we managed to get a photo by holding her iPhone up to the eyepiece. I was skeptical but it came out rather well. This is a crop of the full-size photo to preserve as much magnification as I can get. http://gallery.multi.net.nz/photo/779/ i've never seen anything like it related to electronic prepress, and niether the pattern nor the RGB nature of it is consistent with lithography; the distinct stripeyness makes me think of an imaging process where an image is projected through gratings onto film, and for each grating a different color filter is applied the hair may just have been dust present when the red portion was imaged -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On Mar 1, 2014, at 9:18 am, steve harley p...@paper-ape.com wrote: on 2014-02-28 11:37 David Mann wrote I took the opportunity to bring the slide along so we could look at it under the microscope and we managed to get a photo by holding her iPhone up to the eyepiece. I was skeptical but it came out rather well. This is a crop of the full-size photo to preserve as much magnification as I can get. http://gallery.multi.net.nz/photo/779/ i've never seen anything like it related to electronic prepress, and niether the pattern nor the RGB nature of it is consistent with lithography; the distinct stripeyness makes me think of an imaging process where an image is projected through gratings onto film, and for each grating a different color filter is applied the hair may just have been dust present when the red portion was imaged I might be getting somewhere... http://en.wikipedia.org/wiki/Paget_process ...but 1951 seems awfully late for such a process. Given the date of the Australian stuff, maybe the photographer used some old equipment / film that was lying around? I am not sure what the viewing filters look like - if they're thin enough then maybe they were bundled together within the slide mounts, otherwise maybe the slide was made by projecting the original through the viewing filter, although that wouldn't explain the layered structure I saw through the microscope. Plus it doesn't really explain the red hair (maybe that came from the making of the viewing filter). Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
on 2014-02-28 14:03 David Mann wrote I might be getting somewhere... http://en.wikipedia.org/wiki/Paget_process yes, that is close; i found some samples of the Paget pattern, and it appears somewhat different from your slide, e.g.: http://www.awm.gov.au/exhibitions/captured/colour/paget.asp a bit of digging led me to Dufaycolor, whose pattern matches exactly, and which was in use later in the century (though 1951 still seems late); it was used for motion pictures too; from the name you'll find several references, but this was particularly instructive: http://zauberklang.ch/filmcolors/timeline-entry/1257/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On Sat, Mar 01, 2014 at 10:03:06AM +1300, David Mann wrote: On Mar 1, 2014, at 9:18 am, steve harley p...@paper-ape.com wrote: on 2014-02-28 11:37 David Mann wrote I might be getting somewhere... http://en.wikipedia.org/wiki/Paget_process ...but 1951 seems awfully late for such a process. Given the date of the Australian stuff, maybe the photographer used some old equipment / film that was lying around? That's like saying that 2014 is mighty late for people to be shooting Tri-X in a large format camera. I am not sure what the viewing filters look like - if they're thin enough then maybe they were bundled together within the slide mounts, otherwise maybe the slide was made by projecting the original through the viewing filter, although that wouldn't explain the layered structure I saw through the microscope. Plus it doesn't really explain the red hair (maybe that came from the making of the viewing filter). Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- Larry Colen l...@red4est.com http://red4est.com/lrc -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On Mar 1, 2014, at 10:46 am, steve harley p...@paper-ape.com wrote: on 2014-02-28 14:03 David Mann wrote I might be getting somewhere... http://en.wikipedia.org/wiki/Paget_process yes, that is close; i found some samples of the Paget pattern, and it appears somewhat different from your slide, e.g.: http://www.awm.gov.au/exhibitions/captured/colour/paget.asp a bit of digging led me to Dufaycolor, whose pattern matches exactly, and which was in use later in the century (though 1951 still seems late); it was used for motion pictures too; from the name you'll find several references, but this was particularly instructive: http://zauberklang.ch/filmcolors/timeline-entry/1257/ That looks like it. I had made a mental note to search for images of the Paget pattern later but you've done it for me. You're right that the Dufaycolor pattern matches. The description of the manufacturing process seems to fit with the order of layers I observed. There are lots of PDFs linked towards the bottom of the page so I might have a fair bit of reading to do. Much appreciated :) I owe you a virtual beer. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
Great sleuthing and an interesting printing process! Mark On 2/28/2014 4:46 PM, steve harley wrote: on 2014-02-28 14:03 David Mann wrote I might be getting somewhere... http://en.wikipedia.org/wiki/Paget_process yes, that is close; i found some samples of the Paget pattern, and it appears somewhat different from your slide, e.g.: http://www.awm.gov.au/exhibitions/captured/colour/paget.asp a bit of digging led me to Dufaycolor, whose pattern matches exactly, and which was in use later in the century (though 1951 still seems late); it was used for motion pictures too; from the name you'll find several references, but this was particularly instructive: http://zauberklang.ch/filmcolors/timeline-entry/1257/ -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
David Mann wrote: On Mar 1, 2014, at 10:46 am, steve harley p...@paper-ape.com wrote: on 2014-02-28 14:03 David Mann wrote I might be getting somewhere... http://en.wikipedia.org/wiki/Paget_process yes, that is close; i found some samples of the Paget pattern, and it appears somewhat different from your slide, e.g.: http://www.awm.gov.au/exhibitions/captured/colour/paget.asp a bit of digging led me to Dufaycolor, whose pattern matches exactly, and which was in use later in the century (though 1951 still seems late); it was used for motion pictures too; from the name you'll find several references, but this was particularly instructive: http://zauberklang.ch/filmcolors/timeline-entry/1257/ That looks like it. I had made a mental note to search for images of the Paget pattern later but you've done it for me. You're right that the Dufaycolor pattern matches. The description of the manufacturing process seems to fit with the order of layers I observed. There are lots of PDFs linked towards the bottom of the page so I might have a fair bit of reading to do. Much appreciated :) I owe you a virtual beer. This is a really fascinating investigation! Would you like me to call my friend at the George Eastman House and see if they have any more information on this? -- Mark Roberts - Photography Multimedia www.robertstech.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On Mar 1, 2014, at 1:22 pm, Mark Roberts postmas...@robertstech.com wrote: This is a really fascinating investigation! Would you like me to call my friend at the George Eastman House and see if they have any more information on this? That'd be great if you could. I thought about sending an enquiry via the Kodak website but I realised I'd probably struggle to find info even on modern films. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
David Mann wrote: On Mar 1, 2014, at 1:22 pm, Mark Roberts postmas...@robertstech.com wrote: This is a really fascinating investigation! Would you like me to call my friend at the George Eastman House and see if they have any more information on this? That'd be great if you could. I thought about sending an enquiry via the Kodak website but I realised I'd probably struggle to find info even on modern films. I just sent a note to my friend Stacy. She runs their conservation lab, so this isn't really her area of expertise but she works closely with Mark Osterman, who's their Photographic Process Historian. Perhaps he'll be able to tell us more. -- Mark Roberts - Photography Multimedia www.robertstech.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
I suspect that someone photographed magazine pages. I don’t think the dot pattern is in the film. Paul On Feb 27, 2014, at 4:32 PM, David Mann dmann...@gmail.com wrote: Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ As you can imagine it's fiendishly difficult to scan. Once I have a good scan (ie not blown out) it's quite easy to get rid of the pattern in Photoshop. Note I haven't done any colour corrections other than increasing the brightness a bit. I've had a look using a 10x loupe and it looks a bit like an LCD screen but is hard to make out at such a low magnification. I might try a higher res scan later, and I'll find out whether the microscope at my wife's work has a camera. Could anyone fill me in on what the film might be? The photo in the pic was taken in 1951. In case you're curious it's part of a photo taken at the top of Dyers Pass after a snow storm. I might post the full pic in future. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
Unless it is Polachrome: http://blog.timesunion.com/chuckmiller/playing-with-polaroids-polachrome-instant-slide-film/5835/ Dario -Messaggio originale- From: Paul Stenquist Sent: Thursday, February 27, 2014 10:57 PM To: Pentax-Discuss Mail List Subject: Re: Strange old colour film I suspect that someone photographed magazine pages. I don’t think the dot pattern is in the film. Paul On Feb 27, 2014, at 4:32 PM, David Mann dmann...@gmail.com wrote: Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ As you can imagine it's fiendishly difficult to scan. Once I have a good scan (ie not blown out) it's quite easy to get rid of the pattern in Photoshop. Note I haven't done any colour corrections other than increasing the brightness a bit. I've had a look using a 10x loupe and it looks a bit like an LCD screen but is hard to make out at such a low magnification. I might try a higher res scan later, and I'll find out whether the microscope at my wife's work has a camera. Could anyone fill me in on what the film might be? The photo in the pic was taken in 1951. In case you're curious it's part of a photo taken at the top of Dyers Pass after a snow storm. I might post the full pic in future. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. - Nessun virus nel messaggio. Controllato da AVG - www.avg.com Versione: 2013.0.3462 / Database dei virus: 3705/7130 - Data di rilascio: 27/02/2014 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
However, Polachrome was 1983 (I shot a couple rolls back then), not 1951. Dario -Messaggio originale- From: Paul Stenquist Sent: Thursday, February 27, 2014 10:57 PM To: Pentax-Discuss Mail List Subject: Re: Strange old colour film I suspect that someone photographed magazine pages. I don’t think the dot pattern is in the film. Paul On Feb 27, 2014, at 4:32 PM, David Mann dmann...@gmail.com wrote: Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ As you can imagine it's fiendishly difficult to scan. Once I have a good scan (ie not blown out) it's quite easy to get rid of the pattern in Photoshop. Note I haven't done any colour corrections other than increasing the brightness a bit. I've had a look using a 10x loupe and it looks a bit like an LCD screen but is hard to make out at such a low magnification. I might try a higher res scan later, and I'll find out whether the microscope at my wife's work has a camera. Could anyone fill me in on what the film might be? The photo in the pic was taken in 1951. In case you're curious it's part of a photo taken at the top of Dyers Pass after a snow storm. I might post the full pic in future. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. - Nessun virus nel messaggio. Controllato da AVG - www.avg.com Versione: 2013.0.3462 / Database dei virus: 3705/7130 - Data di rilascio: 27/02/2014 -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
on 2014-02-27 14:32 David Mann wrote Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ can you post a snip at 100%? the pattern as far as i can make it out doesn't have traditional halftone angles, and appears to be RGB, rather than CMYK; this would suggest it was shot from a display or some other transmissive, rather than reflective, source; what that could have been in 1951 i have no idea - is the actual slide from 1951, or is it perhaps a repro slide shot off of a video of the original? -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
On Feb 28, 2014, at 12:27 pm, steve harley p...@paper-ape.com wrote: can you post a snip at 100%? OK since it's started raining and I have nothing better to do I've rescanned a section at 4800ppi. It just gets weirder. http://gallery.multi.net.nz/photo/777/ It's definitely RGB but in a crosshatch pattern. I am stumped. Here's the full frame with some quick Photoshop adjustments: http://gallery.multi.net.nz/photo/778/ The crop is from the left of the column's plinth. The slide measures 56x54mm; close enough to 6x6cm format. I'm still trying to organise access to a microscope but that's looking unlikely as the one I had in mind doesn't have a camera attachment. the pattern as far as i can make it out doesn't have traditional halftone angles, and appears to be RGB, rather than CMYK; this would suggest it was shot from a display or some other transmissive, rather than reflective, source; what that could have been in 1951 i have no idea - is the actual slide from 1951, or is it perhaps a repro slide shot off of a video of the original? Interesting, isn't it? I'd love to get the slide out of its mount but I'm unwilling to remove it (I'd want an archivist to do something like that). I've also noticed a fairly prominent hair in red so I'm wondering if each colour was developed separately. I've heard of a process where each primary colour is shot on BW film through a filter then reassembled later. I might also send it to my favourite camera shop, they have a couple of older guys there who might be able to offer an explanation. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
At first glance I wonder if they were created with some early type of film recorder. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
Re: Strange old colour film
I had a reply from the camera shop: --- Our in-store committee thinks it might be a copy-neg/slide from a litho original, hence seeing all the lines from the pre-press screens used in the print process. If not that, then we’re in the dark too. --- I'm interested to know what others think. Cheers, Dave On Feb 28, 2014, at 12:27 pm, steve harley p...@paper-ape.com wrote: on 2014-02-27 14:32 David Mann wrote Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ can you post a snip at 100%? the pattern as far as i can make it out doesn't have traditional halftone angles, and appears to be RGB, rather than CMYK; this would suggest it was shot from a display or some other transmissive, rather than reflective, source; what that could have been in 1951 i have no idea - is the actual slide from 1951, or is it perhaps a repro slide shot off of a video of the original? -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
RE: Strange old colour film
I wonder whether the image is the result of an early scanning process, perhaps a wirephoto? I don't think it could be the result of one of the late 19th. early 20th.century colour film processes, as the colour bands suggest some sort of mechanical scan, rather than the random arrangement of colour pigment carriers which most of those early processes used. Quite intriguing anyway, as it's not exactly great art! John Coyle Brisbane, Australia -Original Message- From: PDML [mailto:pdml-boun...@pdml.net] On Behalf Of David Mann Sent: Friday, 28 February 2014 7:32 AM To: Pentax-Discuss Mail List Subject: Strange old colour film Here's something the more experienced photographers might be able to help me with... Among these old slides I've been scanning are a handful of colour ones which are not part of the Australian stuff. A few of these colour ones (but not all) appear to have a kind of halftone pattern. See here for an example at 1200ppi. http://gallery.multi.net.nz/photo/771/ As you can imagine it's fiendishly difficult to scan. Once I have a good scan (ie not blown out) it's quite easy to get rid of the pattern in Photoshop. Note I haven't done any colour corrections other than increasing the brightness a bit. I've had a look using a 10x loupe and it looks a bit like an LCD screen but is hard to make out at such a low magnification. I might try a higher res scan later, and I'll find out whether the microscope at my wife's work has a camera. Could anyone fill me in on what the film might be? The photo in the pic was taken in 1951. In case you're curious it's part of a photo taken at the top of Dyers Pass after a snow storm. I might post the full pic in future. Cheers, Dave -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
