You can search for identifiers within the package.
in-package search v0.2.0
type t
val init : string -> (t, error) Stdlib.result
val spec : t -> Spec.t
val read_image : ?index:int -> t -> ('a, 'b, [> `Rgba | `Rgb | `Gray ]) Bimage.Image.t -> (unit, error) Stdlib.result
val read : ?index:int -> t -> ('a, 'b) Bimage.Type.t -> [< `Rgba | `Rgb | `Gray ] as 'c Bimage.Color.t -> (('a, 'b, 'c) Bimage.Image.t, error) Stdlib.result