Define colorspaces for imagemagick comparison #4839
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Description
Fixes #4836
ImageMagick 7.1.1-12 changed the default colorspaces used by the PHASH
compare function from sRGB,HCLp to xyY,HSB. This breaks the current code
for comparisons, so let's define the colorspaces ourselves.
To Do
docs/
to describe it.)docs/changelog.rst
near the top of the document.)