Aim: from a picture, crop an area and save that area in a new file
Open Krita with the original picture.
Select the Select a rectangular area tool in the Krita toolbar.
Select the area you want to make a new picture with. Krita makes the outside area grey.
Then use the -> menu item or Ctrl+C to copy the selected area.
Click again on the Edit menu.
Use the Paste into new image item.
Krita opens a new window with the selected area as new image.
Save the new image.
Aim: draw a coloured rectangle on your picture
Open Krita with the original picture. My picture consists of a view of a toolbar in which I want to point an icon by putting a red rectangle around it.
Enable the Brushes and Stuff toolbar using -> menu.
Also make sure the palettes are viewed. If not, use the -> menu.
Click on the Brush Shapes icon in the Brushes and Stuff toolbar.
Select which brush shape you want to use among the predefined brushes.
Select the drawing shape on the Krita toolbar. I choose a rectangle.
In the Colors palette, select the color you want by clicking on one of the tabs and then choosing the color.
Finally draw your shape on your picture and save the new picture!
Thanks go to Anne-Marie Mahfouf for providing this tutorial.
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