Effects > Edge > Sobel
Sobel
The Sobel filter allows you to detect edges in the image using the Sobel method.
1. Choose Effects > Edge > Sobel
2. Use the following options:
  Invert
Inverts the color channels, Red -> 255 - Red, Green -> 255 - Green, Blue -> 255 - Blue.
Using Preview Windows
Favorites and History
Related Information
Search the Internet