postrm is in imagemagick-common 8:6.7.7.10-6ubuntu3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | #!/bin/sh
set -e
dpkg-maintscript-helper rm_conffile \
/etc/ImageMagick/sRGB.icm 8:6.7.7.0-1~ -- "$@"
dpkg-maintscript-helper rm_conffile \
/etc/ImageMagick/sRGB.icc 8:6.7.7.7-1~ -- "$@"
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