In Astrophotography sometimes we got images out of focus, showing fuzzy stars. Fitswork4 can do some improvements to these kind of pictures, applying the SHARPEN filter.
M31 image is fuzzy, unsharp, blurry.
We have to fix it using a SHARPEN filter.
But we first need to find out the width of a faint fuzzy star.
Then we apply the SHARPEN filter and get a better picture.
This tutorial belongs to a series of small videos for people who want to learn how to do astrophotography and post-processing in a computer, using free software like Fitswork.
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