From: keith_nuttle@sbcglobal.net   
      
   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.)   
      
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