Copy As Image Command (Edit menu)
Note: available only for PDF and XPS documents.
Use this command to copy the selected portion of the active document and save as an image.
Shortcuts
Toolbar: 
Keys: CTRL + I
Example

Click the
and use your mouse to select the image or content that you would like to save onto the clipboard.
Once the selection has been made, the image will be saved to the clipboard and the following dialogue will appear:

Once copied to the Clipboard you can use the command CTRL-V to paste the selection to a document or application as an image.