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olaeblue

Noise Reduction Advice

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I have been using Paint.net to crop and reduce the noise on some scanned old club handbooks, printed in late 1800 & early 1900.

Using effects > 'reduce noise' with radius 200 & strength 1 does the job perfectly. The problem I have is that I have about 60 books each of which is some 100 pages so doing this all manually is not really feasible.

I have found Imagemagick and it seems to do the batch processing of crop well, but I can't find the equivalent function to 'reduce noise'.

I think I should use the -blur function in Imagemagick but that requires radius & sigma. So my question is, assuming Blur is the right equivalent function, what is the sigma value that equates to strength 1 in paint.net?

Also if anyone uses Imagemagick and can suggest a better function to reduce noise that would be great.

Thank you

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I don't know what commands you could use in Imagemagick that would be equivalent to what Paint.NET does.

Unfortunately, Paint.NET has no batching or scripting functionality at this time.

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I don't know what commands you could use in Imagemagick that would be equivalent to what Paint.NET does.

Unfortunately, Paint.NET has no batching or scripting functionality at this time.

Thanks Rick,

Can you confirm whether the 'reduce noise' function is a specialist blur and the sigma values, or what is the underlying function(s), so I can try & recreate in imagemagick.

Reduce noise is so effective that if I can do this with IM that would make my day :-)

Andy

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