what are "/tmp/magick-*" files?

[zhcn381]

hi
I found these files in my "/tmp" dir. What are they used for? I'm using Magick++ from ImageMagick-6.8.5-4.

-rw------- 1 admin admin 165M Jun 25 12:48 magick-2152jhe_NTn1xZt4
-rw------- 1 admin admin 176M Jun 22 14:41 magick-23251ngwAdvFZTZbO
-rw------- 1 admin admin 176M Jun 24 13:09 magick-23714BkFddULBnyiO
-rw------- 1 admin admin 176M Jun 27 12:23 magick-24910h9jKSaYHqtkj
-rw------- 1 admin admin 137M Jun 25 12:36 magick-25170oPozBYmShV0t
-rw------- 1 admin admin 176M Jun 27 17:41 magick-26558_vAn4mwEIqZN
-rw------- 1 admin admin 176M Jun 25 10:30 magick-26928VBdOyYpiaN27
-rw------- 1 admin admin 176M Jun 26 14:51 magick-27013wSxKYOYPviJL
-rw------- 1 admin admin 176M Jun 25 12:39 magick-27747wg2VnnI2Xi7O
-rw------- 1 admin admin 165M Jun 25 12:48 magick-5053d6MpRCx71CJX

[snibgo]

When IM can't do its work in main memory, it uses disk. If the process completes normally, the temporary disk files are deleted. If the process fails, these files are often not deleted.

If you have no IM processes running, you can safely delete these files.

[zhcn381]

thank you snibgo!