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3 thoughts on “looking for a way to reduce noise

  1. What you need to use is the GIMP filter “Selective Gaussian Blur”. Note that this comes with GIMP nowadays, and it is NOT the same as regular “Gaussian Blur”. For an old, but accurate, tutorial on this tool, check out the GIMP help page on it:

    http://www.gimp.org/tutorials/Selective_Gaussian_Blur/

    I tried it out on your picture, with a blur radius of 5 and a max delta of 10, and it fixed the noise almost perfectly, while keeping the image sharp.