imagemagick-filter-types
imagemagick-filter-types is a compiled Lisp function in `image.el
'.
(imagemagick-filter-types)
Return a list of the ImageMagick types to be treated as images, or nil.
This is the result of `imagemagick-types', including only elements
that match `imagemagick-enabled-types' and do not match
`imagemagick-types-inhibit'.