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#11
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scanning textured photo?
And lo, peter emerged from the ether
and spake thus: I have some old b/w photos with textured surface like a fine grit sand paper. When I scanned these photos with a flatbed scanner (epson 4870), the textured surface shows up as specks of light and dark spots, almost like a digital photo taken in high ISO. I can reduce this effect somewhat with photoshop and noise reduction software, but they never completely go away. I'm thinking if the scanner's internal light source is more diffused instead of a bright "line" light, the textured surface would not be as prominent. Does this kind of scanner exist? How do professional scanning service deal with this problem? All of the other posters had good ideas. As far as using fluid on the original, I would shy away from that. It is possible to use mineral oil to lessen the sheen of silvering, but what you're talking about is (I believe) the artistic textured surfaces applied to photos in the '60s and '70s. Often the texture is made up of hexagonal or octagonal shapes, also sometimes diamond. One technique I've used before (with some success) is to scan the image both right side up as well as upside down so that in each of the two versions the flatbed scanner light is hitting the texture from the opposite angle. Combining the two can be a trick. First, you must align the images perfectly. To do this I typically set the top layer to "difference" mode and adjust it until the whole image appears black. Then you can try different layer blending modes (darken sounds like a good bet, although it depends on your situation). There are probably more sophisicated combinatorial techniques such as the ones discussed on the ImageJ page, but I am not much of a guru in that area. I really do hate those textured photos. -- Aaron http://www.fisheyegallery.com http://www.singleservingphoto.com |
#12
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scanning textured photo?
I wonder if you couldnt just... you know... copy them
photographically ? maybe playing with softer lighting and/or a polarizing filter(?) might produce good enough results with a digital ? On Jul 11, 9:50 pm, "peter" wrote: I have some old b/w photos with textured surface like a fine grit sand paper. When I scanned these photos with a flatbed scanner (epson 4870), the textured surface shows up as specks of light and dark spots, almost like a digital photo taken in high ISO. I can reduce this effect somewhat with photoshop and noise reduction software, but they never completely go away. I'm thinking if the scanner's internal light source is more diffused instead of a bright "line" light, the textured surface would not be as prominent. Does this kind of scanner exist? How do professional scanning service deal with this problem? |
#13
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scanning textured photo?
And lo, stuseven emerged from the ether
and spake thus: I wonder if you couldnt just... you know... copy them photographically ? maybe playing with softer lighting and/or a polarizing filter(?) might produce good enough results with a digital ? On Jul 11, 9:50 pm, "peter" wrote: I have some old b/w photos with textured surface like a fine grit sand paper. When I scanned these photos with a flatbed scanner (epson 4870), the textured surface shows up as specks of light and dark spots, almost like a digital photo taken in high ISO. I can reduce this effect somewhat with photoshop and noise reduction software, but they never completely go away. I'm thinking if the scanner's internal light source is more diffused instead of a bright "line" light, the textured surface would not be as prominent. Does this kind of scanner exist? How do professional scanning service deal with this problem? The best approach I've ever seen for eliminating specular light reflection was by Bill Atkinson in his photography of rock slices: http://www.billatkinson.com/Generate...&filter=_Rocks He used two hot lights (of some obscure variety for certain color temperature reasons) rigged with diffusers made from home improvement store materials and polarizing filters. This requires somewhat large polarizing "gobos" and I'm not sure where he got them. The lights are positioned at 45 degrees and the polarizing filter on the camera is turned perpendicular to the filters on the lights, thereby eliminating almost all specular reflection. Diffuse reflection, of course, is not longer perfectly polarized so it makes it through. I learned this in one of Michael Reichmann's videos (luminous-landscape.com); I think it's the only one with Atkinson in it. Truly amazing results. -- Aaron http://www.fisheyegallery.com http://www.singleservingphoto.com |
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