To clarify the above, graphicsmagick-imagemagick-compat specifies
"Provides: imagemagick" but Provides are ignored by dependency
resolution when version numbers are specified.

>From the debian policy document:

'If a relationship field has a version number attached, only real
packages will be considered to see whether the relationship is satisfied
(or the prohibition violated, for a conflict or breakage). In other
words, if a version number is specified, this is a request to ignore all
Provides for that package name and consider only real packages. The
package manager will assume that a package providing that virtual
package is not of the "right" version. A Provides field may not contain
version numbers, and the version number of the concrete package which
provides a particular virtual package will not be considered when
considering a dependency on or conflict with the virtual package name.'

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https://bugs.launchpad.net/bugs/1562560

Title:
  imagemagick is incorrectly set as a dependency - it should be
  recommended/a suggestion

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