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.
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