I was initially dismayed to find that Export and Save As in Openoffice calc only support other spreadsheet formats, XHTML and PDF (to be fair, the XHTML is pretty clean compared to that output by Microsoft Office but it wasn’t what I wanted in this case).

After some playing around, I figured out a pretty easy way of converting my spreadsheet to an image. I highlighted the table in Openoffice calc and clicked on Edit / Copy. Then I started the GNU Image Manipulation Program (GIMP) – I guess other graphics programs should work equally well – and clicked on File / Acquire / Paste as New and voilà – the spreadsheet appeared in a new GIMP window ready to be saved in whatever graphics format you wish.

(I did this on a Linux system, I’d be curious to know if the same works on Windows).