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Free Photo Restoration & Date Old Photographs / Re: Scans ain’t scans: Is there a better way of removing the “fish scales”?
« on: Monday 26 June 17 16:30 BST (UK) »
Mike Morrell,
Some very useful information you have provided. GIMP has the Wavelet Decompose for such retouching (and it can also be used for selective sharpening).
I have used multiple scans on only a few occasions, always four at right angles to each other. Then rotate all to be the same and align them. Hugin is the best way of aligning images, but a bit complex if you are not familiar with it. In Linux I can do the alignment very quickly from the terminal - there is probably a similar method from the command line in Windows, but it is many years since I last used Windows!
Having aligned your stack of images, there are two approaches - keep the bottom layer at 100% opacity, the next layer at 50%, next at 33% and the top layer at 25%.
The other method is to use median blending of the layer stack.
Sometimes one method works best, sometimes the other.
dafydd46.
Some very useful information you have provided. GIMP has the Wavelet Decompose for such retouching (and it can also be used for selective sharpening).
I have used multiple scans on only a few occasions, always four at right angles to each other. Then rotate all to be the same and align them. Hugin is the best way of aligning images, but a bit complex if you are not familiar with it. In Linux I can do the alignment very quickly from the terminal - there is probably a similar method from the command line in Windows, but it is many years since I last used Windows!
Having aligned your stack of images, there are two approaches - keep the bottom layer at 100% opacity, the next layer at 50%, next at 33% and the top layer at 25%.
The other method is to use median blending of the layer stack.
Sometimes one method works best, sometimes the other.
dafydd46.