Drop-shadow operation. The shadow is the source's alpha
silhouette, blurred, tinted, scaled by :opacity, and
composited beneath the original at (:dx, :dy). Maps to
ImageKit's e-shadow=... parameter family.
:color is normalised to a 3-element [r, g, b] 0..255 list
by the provider parser.
Summary
Types
@type t() :: %Image.Plug.Pipeline.Ops.DropShadow{ color: [non_neg_integer()], dx: integer(), dy: integer(), opacity: float(), sigma: float() }