"Roger Donne" <roger@donne.free-online.co.uk> wrote > Now I've looked at the 'Save as' options I can see that, as you say, the > TIF file was saved with no compression and the PDF file was saved with ZIP > compression and Quality '80' (whatever that means). Should the file sizes > be more or less the same when similar compression is applied? Roger, I suspect that the answer to that is 'it all depends...'. Tiff files can be saved with LZW compression, which is lossless. Presumably that will give you better quality results than any lossy compression. But whether you could detect the difference would be another question altogether. HTH, -- Tim S. (please delete myfairlyobviousspamtrap if you wish to reply directly)