Binary package “ruby-fastimage” in ubuntu mantic
Ruby library for finding the size or type of image with minimal dependency
FastImage does this minimal fetch for image types GIF, JPEG, PNG, TIFF,
BMP and PSD.
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And it doesn't rely on installing external libraries such as RMagick
(which relies on ImageMagick or GraphicsMagick) or ImageScience (which
relies on FreeImage).
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You only need supply the uri, and FastImage will do the rest.