[magick-users] ImageMagick temporary files

[duc.sequere.aut.de.via.decede at imagemagick.org]

> magick-* files filling up /tmp

ImageMagick creates temporary files for a number of reasons including
when dealing with delegates or if the image size exceeds the memory limits.
If the program exits gracefully these temporary files should be cleaned up on
exit.  If not, try upgrading to a recent version of ImageMagick.  Use
MAGICK_TMPDIR to write temporary files to a path other than the system default.