4.2.1. Answer to how one can sharpen

Demo

  1. Open lena.png
  2. Invoke the "Convolution Matrix" dialog.
  3. Type 12 in the middle square and -1 in the 8 surrounding squares.
  4. Type 4 as a divisor (12 + 8 * (-1) == 4).
  5. Apply.

Written by Shlomi Fish