I’m having trouble getting Omeka S to generate thumbnails for my PDF files. JPGs and PNGs seem to work just fine.
I created two sample items on the site so you get a sense https://ebp.newmedialab.cuny.edu/s/east-bay-punk-digital-archive/item
I took a quick look on the forum and saw that most folks said it’s got to do with either ImageMagick and/or Ghostscript, but our server’s administrator said both are installed and working correctly. On the server, he successfully ran imagemagick’s
convert to make a pdf thumbnail with this argument:
< /home/ebp/public_html/files/original # convert -thumbnail x300 -background white -alpha remove 055e61b21d71fcba6d7fab2614c9ada78c65741c.pdf out.png >
That also seemed to work just fine. So Omeka S can save files to the server, can make thumbnails using imagemagick from those files (at least when they’re images), and can save thumbnails. Also, imagemagick on the server is built properly, with ghostscript installed, so that it can make thumbnails from PDFs. Given those facts, we’d expect that Omeka S could make a PDF thumbnail.
As for a reason for the problem, our server admin’s first guess is that perhaps the call to convert has a problematic argument or two, i.e. that it doesn’t look exactly like the line above, but without learning a lot more about how thumbnail generation works, that’s hard to test. If someone has any lead (or knows how the thumbnail creator works) that would be much appreciated!
Many thanks for your help.