>> I don't suppose there's any easy way to use an automatic jpg
>> thumbnail....... but only if the browser appears not to have an
>> appropriate plug-in for displaying tiffs inline.
>>
>
> The DjVu and PDF handlers provides thumbnails as jpgs.
>
> I would expect that the TIFF handler will also do this, otherwise it
> will not integrate with the Proofread Page extension.
>
On a related note is there any chance of getting the ability to specify
thumbnail formats when adding an image to a page and/or determining what
format to use huristically? We already support png which is a lossless
format with wide support and better compression than TIFF but if you
upload a photo as a png at the moment the thumbnails will also be pngs
which is generally bad.