New answers tagged plugins
The free Copy Image plug-in should work. The plug-in is executed via Edit -> Copy image. As the readme states, The image is copied as an 8bits per channel image. If the active project is 16 or 32bits per channel, downsampling is performed.
If you're on a mac, you can press ctrl+cmd+shift+4, drag a box over the viewport, and the resulting image will be copied to your clipboard. This won't be a high quality file, and is dependent on the zoom/quality of your viewport.
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