This workflow demonstrates how the Base64 Encode action can be used to encode and decode data. The workflow begins by grabbing the last image (including screen shots). It then encodes the image producing a set of text (that could be copied into some system that only supports text) displayed via a Quick look action.
The text is then passed into the Base64 Encode action again, but this time the Decode parameter is set (instead of Encode). This converts the text back into an image which is then shown via the Quick Look action.