>On Wednesday 04 January 2017 18:58:20 paulhurm wrote: >The black paper, and the glue, totally preclude any thoughts of its >being >an archival quality mounting medium. There is some acid in all that >stuff that old. > >So you must do what can be done with the scans you have. >You it appears, are truely between a rock, and a hard place. The only >other possible procedure would involved crafting a very narrow band >color filter, centered on the silvery tint, which might be further >filtered to recover its luminance detail, and re-add that detail to >the >K channel of a cmyk encoded copy of the original scan. I doubt that it >could be scripted because of the variations in the aging of the >individual print. Under the conditions you describe, you would probaby >have to separate each print on the page into its own file for >individual >processing. You would need to develop a filenameing convention that >included the page it was on, the upper left corner position marker, >and >the images own size, including any captions involved, so that once >they >were recovered as best as can be done, a relatively simple script >could >put it back together with everything in its original location for then >making a single page image that could then be printed at high enough >resolution that other researchers could learn from it. > >I don't envy that position... > >How about you make an "unsharp mask", crank up the contrast, then >print >with the unsharp mask subtracted to reduce the contrast back to maybe >20% more than you started with? That might find usable detail you >cannot see very well now. > >Cheers, Gene Heskett
I do have a bit of this already done. I do have each photograph as individual scans, both with and without the captions and I am not too worried right now about the final "reassembly". My current desire is just to get the issue resolved with the quality of the prints. I already have ideas about "reassembly" but not worrying about this step until I get better quality images. As mentioned, I had a few steps accomplished once before but can't remember what I had done. I still seem to recall having used an addin somehow and playing around with luminance so that comment by you helps validate some of my current thinking. I think my next step might have to be to try to go through the various lists of addins to see if I can find one that might help or perhaps stumble upon what I used before. I'm way too green to develop my own filter as you suggested above although the concept you described seems good. I kind of had that accomplished in the previous attempt where I did get the desired areas separated onto a separate layer. It's just that I now have no idea what I did to get to that point. Thus my post hoping for suggestions!! Thanks. Paul -- paulhurm (via www.gimpusers.com/forums) _______________________________________________ gimp-user-list mailing list List address: [email protected] List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list
