There is some vertical banding near the tree trunks in the following image.
Is there a way remove this type of artefact, preferably using Mathematica?
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2$\begingroup$ @RodrigodeAzevedo no, JPEG artifacts are local to 16x16 pixel blocks. The artifacts in the question appear to follow the trees that are much farther away from the artifacts than that. $\endgroup$ – Olli Niemitalo Oct 27 '17 at 15:53
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