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Added sharpness filter #942
When tiles are resized, a sharpening filter is applied. The sharpness intensity will vary depending on zoom level. This can be adjusted by changing these lines in overviewer_core/tileset.py:
 # Intensity of the sharpness filter when zoomed all the way in, range = [0, 1]
Sharpness can range from 0 (no effect) to 1 (maximum effect). If initial_sharpness = 0, the code for the sharpening filter is never executed. For each level zoomed out, the intensity is multiplied by decay_rate. If the decay_rate is set to 1, the effect intensity will stay fixed regardless of zoom.
Things that should probably be evaluated before being enabled in master: