<p>As regarding of sharpening, Nothing beats Multi Scale methods which decomposes the image into "Layers" of different frequencies (Like Equalizer).<br>
Found blog posts which explains it much better than I can on this forum:<br>
<a href="http://www.davidebarranca.com/2012/09/decomposing_sharpening_part_1/">http://www.davidebarranca.com/2012/09/decomposing_sharpening_part_1/</a><br>
<a href="http://www.davidebarranca.com/2014/07/introducing-fixel-detailizer/">http://www.davidebarranca.com/2014/07/introducing-fixel-detailizer/</a><br>
Enjoy...</p>