Maybe this will help?

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-clipboard
The clipboard option can be used with the Capture and MetaFile commands to place copies of widget windows on the clipboard. The format of the clipboard option is as follows:

... -clipboard boolean

where boolean indicates that the image or metafile is to be written to the clipboard if its value is "true", "yes" or "1". By default, images or metafiles are not written to the clipboard.

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From page:
http://pages.infinit.net/cclients/files/tkprint1.1.html

In reply to Re: Tk canvas to clipboard by TedPride
in thread Tk canvas to clipboard by ChrisR

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