====== Sharpen ======

**What does the sharpen filter do?**

Increases contrast and accentuates detail in the image or selection, but may also accentuate noise. This filter uses the following weighting factors to replace each pixel with a weighted average of the 3x3 neighborhood.

<code>
  -1 -1 -1
  -1 12 -1
  -1 -1 -1
</code>