crop images

[Stefano_68]

Bye to all,
I used masking to shield a part of image,
but I don't understand how:
- define a polygonal shape that visualizes the portion of image contained within it instead of hiding it.
In this case I am forced to make 2 or more masks to get what I want.

Thank you.

 

[Tristan]

Don't you first cut it out on an image management software? the web is also full of free (like gimp or paint .net)