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Removing dust from digital scans

Nov 17, 2010, 19:14
Post: #1
Removing dust from digital scans
I'm making scans of public domain musical scores for imslp.org. I scan the scores as TIFFs, then do some cropping and resizing in gimp before I convert them to PDFs.

Some of the scores are old and dirty, and there is a lot of noise coming through on the scans. I've found tutorials for removing dust from photos, but I don't think those procedures will work for removing dust from black and white scans. I'm looking for a filter that will do automatic cleanup on a whole file all at once. Does gimp have anything like this?
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Nov 17, 2010, 20:32
Post: #2
RE: Removing dust from digital scans
If the noise is greyish, you can use Colors/threshold to convert the score to B&W. With the rigt threshold value, most of the noise will be converted to white and disappear.

If it's small speckles, smaller than the score lines (a few pixels), you can also use the magic wand to select the background, and then grow the selection by a pixel or two, then shrink the selection back. All the small speckles will be selected but the score won't. Then delete the selection to convert the speckles to transparency or white. You may want to adjust the wand threshold.

Now answering your questions on
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