How do I save images of graphical playground results?

This is how you save an image resulting from code execution in the playground or a screenshot of a SpriteKit scene:

1. Click on the preview image in the results view of the playground to bring up a popover window with the image or SpriteKit scene.
2. In the "File" menu, select "Export Result Image…" and select the file where you want to save the image.

Images are saved in PNG format.