Click the File menu's "Open" command, and then navigate to and double-click a picture whose background you'd like to animate. Paint.NET will load the image.2
Click the toolbar icon shaped like a blue balloon to enter selection mode. Drag the mouse over the outline separating the foreground from the background to select the background. Press and "Control" and "X" simultaneously to cut out the background.3
Click the "Layer" panel's page icon to create a new layer, and then press "Control" and "V" simultaneously to paste the cutout background onto the new layer.4
Press "Control" and "S" simultaneously to display the "Save" dialog. Type a file name in the "Name" text box, and then click "Save" to save the file.5
Click the toolbar icon shaped like a "
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