# HDR thumbnailer


This is a note to myself in case I need it again in the future...

pcmanfm, my favorite file manager, uses the gnome3 thumbnailing system,
which makes it very easy to write thumbnailers for new filetypes.
Thumbnailers are small programs that take a file of a certain type, and
create a small png image of it. So in this example, I'm using
imagemagick, the famous image conversion tool that you'll find on
almost any linux distro, to make a thumbnailer for HDR images. The
thumbnailer is composed of two files:

hdr.thumbnailer (place it in /usr/share/thumbnailers or
~/.local/share/thumbnailers):

    [Thumbnailer Entry]TryExec=imagemagick-thumbnailerExec=imagemagick-thumbnailer %i %o %sMimeType=image/hdr;image/x-hdr;


imagemagick-thumbnailer (place it in /usr/bin or any other folder that
is in your binary search path):

    #!/bin/sh/usr/bin/convert "$1" -thumbnail 64x64 -gravity center -background white -extent 48x48  png:"$2"


One last thing, I suggest you delete /usr/share/mime/packages/kde.xml
(installed by kdelibs5-data) because it horribly messes with several
file formats (such as HDR) and the mime system doesn't recognize them
anymore.