What happens if you paint on a Quickmask with white?

How do you delete a guide?

What are the four selection modes?

How can you automatically fix an underexposed image?

What does it mean when a file is dirty?

What does the color area in the toolbox show?

What tool can be used to sharpen a slightly blurry image?

How can you quickly restore dialogs that have been closed?

In order to have varying degrees of transparency in a single layer...

Instead of tracing around an area of interest, which tool allows you to paint your selection?

After adding a new brush to GIMP's search path, what must you do to make it visible in the toolbox?