To enable the selection of a portion of the active document to be saved to the Clipboard as an image, please use the “Take Snapshot” command from the Edit menu.
CTRL + SHIFT + C (,), COMMAND + SHIFT + C ()
For scanned PDF documents, the only selection method available is area-based selection. To copy an image to the Clipboard, first select the "Take Snapshot" command from the Edit menu, then use your mouse to select the image or content that you would like to save as an image, as you would normally select an area for a scanned PDF document.
Once the selection has been made, the image will be saved to the clipboard and the following dialogue will appear:
This article refers to Able2Extract and Able2Extract Professional.