Which tool to crop a portion of the screen?

I can see how to use Gimp to crop part of an image in a image file, but I want to crop a portion of the screen. How do you do that?

Solution 1:

On Gnome Shell (17.10+)

To use the built-in gnome-screenshot capability (by default):

• Ctrl+PrintScreen to copy a screenshot of the whole desktop.

• Ctrl+Alt+PrintScreen to copy a screenshot of the current active window.

• Ctrl+Shift+PrintScreen to copy a screenshot of an area you select with your mouse.

• PrintScreen to save a screenshot of the whole desktop at /home/user/Pictures.

• Alt+PrintScreen to save a screenshot of the current active window at /home/user/Pictures.

• Shift+PrintScreen to save a screenshot of an area you select with your mouse at /home/user/Pictures.

On Unity

To use the built-in Screenshot capability:

• PrintScreen to copy a screenshot of the whole desktop.
• Alt+PrintScreen to copy a screenshot of the current active window.
• Shift+PrintScreen to copy a screenshot of an area you select with your mouse.

Solution 2:

Applications > Accessories > Take Screenshot... Select area to grab.