I think @simon meant that the same clipboard content is available as text and image.
I just tested it by copying multiple cells out of LibreOffice Calc. It puts tab delimited text and an image of the cells into the clipboard. I assume Microsoft Excel does the same.
The result is this:
column A column B a1 b1 a2 b2 ![image|256x77](upload://1CSBoxgR28OkiAGuNNGipzSJTlJ.png)