Sharpening Option

[Ian Soper]

I would recommend adding a unsharp mask or other sharpening filter option. When resizing an icon down from a larger size (like 512 or 1024) the smaller sizes tend to look very blurry. By adding sharpening filters after sizing down, the blurry images can be largely avoided.

[Vladimir Perekladov]

Add sharp option for sharping icons in 0.6.3