Thumbnail woe

26 April 2009

Point 1: The new exam timetable system looks pretty, but doesn’t seem to be a marked improvement on what we had last year. When you download your exam timetable it erroneously tells the computer it’s HTML not a PDF, so you need to change the extension to make it work properly. I have reported this to them, I doubt anything will happen or that they will give me a response, I’m still waiting for a reply to the email I sent almost a year ago.

Point 2: Because my computer read the PDF as HTML the pretty thumbnail was garbled text, the question is how do you fix the thumbnail. Thumbnails are saved in ~/.thumbnails/normal with really helpful names (they look like md5 hashes perhaps?). The answer lies in the tracker-thumbnailer tool.
$ tracker-thumbnailer /path/to/garbled/thumbnail/file
will give you the location of the thumbnail image which you can rm then run
$ tracker-thumbnailer /path/to/garbled/thumbnail/file mimetype normal
which will recreate the thumbnail. You need to change the mimetype to reflect the type of file, such as application/pdf or image/png (there’s a little more help on the man page).

Point 3: There must be an easier way to do this


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