package bimage

bimage — Image processing library

%%VERSION%%

bimage is an image processing library for OCaml.

Features

• Simple image type based on bigarrays
• Supports u8, u16, i32, i64, f32, f64, complex32 and complex64 datatypes
• Multiple layout support (Planar/Interleaved)
• Composable image operations
• Image I/O using ImageMagick/GraphicsMagick and FFmpeg in (bimage-unix)
• Support for displaying images using GTK (bimage-gtk) or SDL (bimage-sdl)

bimage is distributed under the ISC license.

Homepage: https://github.com/zshipko/bimage

Installation

bimage can be installed with opam:

opam install bimage

Additionally, bimage-unix, which provides ImageMagick and FFmpeg bindings, can be installed by running:

opam install bimage-unix

If you don't use opam consult the opam file for build instructions.

Examples

An example showing how to create an image and how to use Image.for_each:

open Bimage

let _ =
(* Create a new image *)
let a = Image.create u8 gray 64 64 in

(* Iterate over each pixel *)
let _ =
    Image.for_each (fun x y _px ->
      Image.set a x y 0 (x + y)
    ) a
in

(* Save the image using ImageMagick *)
Bimage_unix.Magick.write "test1.jpg" a

An example using Op.t to run a filter on an image:

open Bimage
open Bimage_unix

let _ =
(* Load an image using ImageMagick *)
let a = match Magick.read f32 rgb "test/test.jpg" with
  | Ok img -> img
  | Error e -> failwith (Error.to_string e)
in

(* Create an operation to convert to grayscale and subtract 1.0 *)
let f = Op.(grayscale &- scalar 0.5) in

(* Create a destination image *)
let dest = Image.like_with_color gray a in

(* Run the operation *)
let () = Op.eval f ~output:dest [| a |] in

(* Save the image using ImageMagick *)
Magick.write "test2.jpg" dest

Documentation

The documentation and API reference is generated from the source interfaces. It can be consulted online or via odig doc bimage.

Tests

In the distribution sample programs and tests are located in the test directory. They can be built and run with:

dune runtest