dhash
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Rec601LumaColorspace -> GRAYColorspace for newer imagemagick/rmagick
See https://github.com/Nakilon/dhash-vips/issues/16#issuecomment-1100679575
Though note that according to my tests the comparison quality went down a bit, not sure why. Maybe the colorschemes are not really the same, but I suppose there is no way to fix it, it's imagemagick deprecation.
I'm having this issue too.