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Hi all thought I'd share one of the techniques I used to spot restoration through modifying images mid tones. It probably won't pick up restoration done exceedingly well , but worth a play around. It's come in handy to spot border touch ups and in painting touch ups. Have a play and let me know any other tips!
1) Save the hi res image to your local drive e.g.
2) Right Click on image and select "Open With" "Microsoft Office Picture Manager"
3) Click on "Picture" menu and select "Brightness and Contrast" - this opens a pane to the right
4) To view restoration of white areas slide "Midtones: adjust midtones only" to the far left.
You should be able to see the white area airbrushed in contrast to the natural paper
5) To view restoration of darker coloured areas slide "Midtones: adjust midtones only to the far right.
Not the best example, but in several pictures I've tried you can spot the paint touch up of coloured areas much easily
Sometimes I jiggle with contrast and brightness also to bring out touch ups , stains etc..
Let me know how you go!