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Matth · 22-04-2005, 13:43

http://gimp-savvy.com/BOOK/index.html?node61.html
A good description of some correction techniques usin "the Gimp".

In principle, you colour pick pick representative points on a discoloured image, and then use RGB curves to match them to points of the correct colour on a similar image.

Works well for the midrange, but you may have to fiddle the top & bottom of the range - obviously, if there is something that should be white, that gives you a correction point for the top of the range.

Ideally, you want a set of points that should all be neutral:
White, light (but not white), mid grey & dark grey.

22-04-2005, 13:43	#8
Matth Inactive Join Date: Mar 2004 Services: BB:M, TV:XL, Phone:M, Loyalty Posts: 2,516	Re: Improving old photo's http://gimp-savvy.com/BOOK/index.html?node61.html A good description of some correction techniques usin "the Gimp". In principle, you colour pick pick representative points on a discoloured image, and then use RGB curves to match them to points of the correct colour on a similar image. Works well for the midrange, but you may have to fiddle the top & bottom of the range - obviously, if there is something that should be white, that gives you a correction point for the top of the range. Ideally, you want a set of points that should all be neutral: White, light (but not white), mid grey & dark grey.