From: rail@greywall.demon.co.uk   
      
   On 15/05/2020 12:31, knuttle wrote:   
   > On 5/15/2020 3:01 AM, Graeme Wall wrote:   
   >> On 14/05/2020 23:56, knuttle wrote:   
   >>> On 5/14/2020 5:13 PM, Graeme Wall wrote:   
   >>>> On 14/05/2020 20:04, knuttle wrote:   
   >>>>> On 5/14/2020 11:15 AM, J. P. Gilliver (John) wrote:   
   >>>>>> My own experience with feed-mechanism scanners (on documents that   
   >>>>>> aren't particularly fragile) is that it's difficult to keep the   
   >>>>>> document straight; I haven't tried a desktop machine, though, only   
   >>>>>> the portable type (which I've always thought would be useful if I   
   >>>>>> was visiting someone else's home, and wanted to scan something   
   >>>>>> they didn't want to let leave their house but had a scanner).   
   >>>>> My solution to this is run the scans through a image processing   
   >>>>> program and clean it up before saving as a PDF   
   >>>>>   
   >>>>> By clean it up, I mean first square it to the paper to correct any   
   >>>>> missalignment caused by the scanner.  Once square, using the image   
   >>>>> processing tools to make the document more readable.  Mostly color   
   >>>>> corection, Red,green,blue, brightness, contrast, saturations, and   
   >>>>> Gamma correction.  Most of the time the gamma correction resolves   
   >>>>> most problems with the document.  The red,green, blue and other   
   >>>>> color adjustments can bring out things that were nearly lost when   
   >>>>> the document ages.   
   >>>>>   
   >>>>> While I can bring back the color to some photos, I still have not   
   >>>>> found software that can correct the Kodachrome and Kodacolor aging.   
   >>>>   
   >>>> I've found fiddling with the Hue settings helps. Mind you, if you   
   >>>> think Kodachrome is difficult, try Agfachrome!   
   >>>>   
   >>> I said Kodachrome but I also used Agfachrome.  In fact I preferred   
   >>> Agfachrome.   
   >>>   
   >>> It always seemed to me since chemical reactions are very predictable,   
   >>> that it would be easy to develop an algorithm to correct the color   
   >>> degradation of each chemical compound in the emulsion.  If each were   
   >>> applied to the picture,  seems like it could restore the original   
   >>> colors.   
   >>>   
   >>   
   >> What software are you using?   
   >>   
   > My standby is Irfanview,  I have been experimenting with Gimp.   Neither   
   > has an algorithm as I mentioned.   
   >   
   > I have had l limited success using Irfanview, but am not entirely happy   
   > with the results.   Possible because I don't know the colors that were   
   > in the original photo. (Picture of my wife as a baby and her father.)   
   >   
      
   I'm using Photoshop elements which is reasonably successful with a bit   
   of tweaking.   
      
   --   
   Graeme Wall   
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