Darktable high quality resampling2/16/2023 Sharpening is also likely to exaggerate noise, so noise reduction prior to ( or sometimes after ) sharpening is useful. There are techniques to minimize this, but it's best considered a sign you have over-sharpened. Of course you're not adding detail - the detail is simply being transformed in a way that's "easier" for the visual system to catch.Ī side effect is (typically) haloing, where the adjusted pixels along edges form "shadow" edges that are bright or dark. The net effect ( if done with care, as opposed to going over the top ) is to give a visual effect that gives an The simplified version is that sharpening algorithms do some maths that alters pixel values in a way that exaggerates local differences - adjusting some pixels to be brighter and some to be darker. ![]() You asked so here a nice technical explanation :
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