[magick-users] specify inch, update dpi based on pixelsize

[Per]

How do I update the dpi of an image while making IM calculate the actual dpi?
I only want to specify inch (or centimeters), and make IM calculate the dpi (or
dots per centimeter) based on the specified cm/inch and the pixelsize of the
image. Is it possible to do? I don't want to calculate the dpi myself.
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