Mid-pipeline alpha multiplier. :factor is in [0.0, 1.0];
1.0 is a no-op (the normaliser drops the op), 0.0 produces
a fully transparent image. Maps to Cloudinary's o_<n>
(where n / 100 is passed) and ImageKit's e-opacity:<n>.
Summary
Types
@type t() :: %Image.Plug.Pipeline.Ops.Opacity{factor: float()}