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5 messages
5 total messages Started by alan moore Wed, 14 Jul 1999 00:00
silver nitrate emulsion
#124
Author: alan moore
Date: Wed, 14 Jul 1999 00:00
8 lines
1631 bytes
i've an old photo that is playing havoc when i scan(microtek x6) it, most of
the original (so i've been told)is made with silver nitrate and it is this
that reflects thus making the scan very noisy indeed. i've tried pre-scan
filtering/descreen etc, post scan fiddling with corel pp9,taking a photo of
it (dc265) and it still looks shite. can anyone suggest anything please

             a couple of bitters in the pump for you if can help
                                    cheers adm
Re: silver nitrate emulsion
#125
Author: Martin Brown
Date: Wed, 14 Jul 1999 00:00
20 lines
2018 bytes

alan moore wrote:

> i've an old photo that is playing havoc when i scan(microtek x6) it, most of
> the original (so i've been told)is made with silver nitrate and it is this
> that reflects thus making the scan very noisy indeed. i've tried pre-scan
> filtering/descreen etc, post scan fiddling with corel pp9,taking a photo of
> it (dc265) and it still looks shite. can anyone suggest anything please

A photograph taken with diffuse side lighting may be as good as it gets.
I presume the problem is the black parts of the image look silvery ?

Reminds me. I had a wierd problem a while back with a scanner which saw the red
dye in the Fuji instant colour print material as sort of green. The scan results
were unusable.
Anyone else had funny behaviour with particular emulsions ?

Regards,
Martin Brown
Re: silver nitrate emulsion
#126
Author: Mike Russell
Date: Sun, 18 Jul 1999 00:00
20 lines
1852 bytes
Try using a polarized light source and filter.  The reflective silver areas
should darken much more than the normal parts of the photograph.

If this doesn't quite do the job, perhaps you can subtract two photographs
made with different polarizer orientations, create a mask of the areas that
changed value most strongly, then use that mask to selectively darken the
silvered areas.

alan moore wrote in message <7mi75j$r9$1@lure.pipex.net>...
>i've an old photo that is playing havoc when i scan(microtek x6) it, most
of
>the original (so i've been told)is made with silver nitrate and it is this
>that reflects thus making the scan very noisy indeed. i've tried pre-scan
>filtering/descreen etc, post scan fiddling with corel pp9,taking a photo of
>it (dc265) and it still looks shite. can anyone suggest anything please
>
>             a couple of bitters in the pump for you if can help
>                                    cheers adm
>
>
Re: silver nitrate emulsion
#127
Author: B.Rumary
Date: Mon, 19 Jul 1999 00:00
15 lines
1836 bytes
> i've an old photo that is playing havoc when i scan(microtek x6) it, most of
> the original (so i've been told)is made with silver nitrate and it is this
> that reflects thus making the scan very noisy indeed. i've tried pre-scan
> filtering/descreen etc, post scan fiddling with corel pp9,taking a photo of
> it (dc265) and it still looks shite. can anyone suggest anything please
>
*All* old B&W photos use silver nitrate in the emulsion! From what you say, 
you may have got hold of a Daquerretype (?). This was a very early 
photographic process, which was made on a thin metal plate, and forms the dark 
areas by reflection of light on the metal surface (I think!). Apparently these 
are the very devil to copy, due to the reason you stated.

Brian Rumary, England

http://freespace.virgin.net/brian.rumary/homepage.htm
Re: silver nitrate emulsion
#128
Author: Kim Clark
Date: Mon, 19 Jul 1999 00:00
22 lines
1993 bytes
Take it to a photo developer, have them make a copy from the photo (they
will actually take a photo OF the photo).  THEN scan the picture and do with
it what you will.....

Hope this helps

Roger D. Clark
president@southwestohiofoods.com
(on my wifes computer if you email, use the above address)

alan moore wrote in message <7mi75j$r9$1@lure.pipex.net>...
>i've an old photo that is playing havoc when i scan(microtek x6) it, most
of
>the original (so i've been told)is made with silver nitrate and it is this
>that reflects thus making the scan very noisy indeed. i've tried pre-scan
>filtering/descreen etc, post scan fiddling with corel pp9,taking a photo of
>it (dc265) and it still looks shite. can anyone suggest anything please
>
>             a couple of bitters in the pump for you if can help
>                                    cheers adm
>
>
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