3. Using the Quickmask

  1. Open an image or begin a new document;

  2. Activate the Quickmask using the left-bottom button in the image window. If a selection is present the mask is initialized with the content of the selection;

  3. Choose any drawing tool and use it with greyscale colors on the QuickMask;

  4. Toggle off the Quickmask using the left-bottom button in the image window;