Newly gained access to the production temp folders shows me that some ICC profiles are left laying around as temp files:
gilles@thumbor1001:/srv/thumbor/tmp/thumbor@8801$ ls -al
total 20
drwxr-xr-x 3 thumbor thumbor 4096 Oct 12 11:29 .
drwxr-xr-x 40 thumbor thumbor 4096 Oct 12 11:15 ..
srwxr-xr-x 1 thumbor thumbor 0 Oct 12 11:16 manhole-8801
drwx------ 2 thumbor thumbor 4096 Oct 12 11:20 tmpCP66QT
-rw------- 1 thumbor thumbor 524 Oct 12 11:27 tmpvH1Xfr
-rw------- 1 thumbor thumbor 560 Oct 12 11:22 tmpx7alLJ
gilles@thumbor1001:/srv/thumbor/tmp/thumbor@8801$ sudo -u thumbor head tmpvH1Xfr
lcmsmntrRGB XYZ �)9acspAPPL���-lcms
desc�^cprt\
wtpthbkpt|rXYZ�gXYZ�bXYZ�rTRC�@gTRC�@bTRC�@descc2textFBXYZ ���-XYZ 3�XYZ o�8��XYZ b����XYZ $����curv��ck
�?Q4!�)�2;�FQw]�kpz���|�i�}���0��gilles@thumbor1001:/srv/thumbor/tmp/thumbor@8801$ sudo -u thumbor head tmpx7alLJ
0ADBEmntrRGB XYZ �acspAPPLnone���-ADBE
cprt�2desc0kwtpt�bkpt�rTRC�gTRC�bTRC�rXYZ�gXYZbXYZ textCopyright 1999 Adobe Systems IncorporateddescAdobe RGB (1998)XYZ �Q�XYZ curv3curv3curv3XYZ �O��XYZ 4��,�XYZ &1/��gilles@thumbor1001:/srv/thumbor/tmp/thumbor@8801$