Crate image[][src]

Expand description


This crate provides native rust implementations of image encoding and decoding as well as some basic image manipulation functions. Additional documentation can currently also be found in the file which is most easily viewed on github.

There are two core problems for which this library provides solutions: a unified interface for image encodings and simple generic buffers for their content. It’s possible to use either feature without the other. The focus is on a small and stable set of common operations that can be supplemented by other specialized crates. The library also prefers safe solutions with few dependencies.

High level API

Load images using io::Reader:

use image::io::Reader as ImageReader;

let img = ImageReader::open("myimage.png")?.decode()?;
let img2 = ImageReader::new(Cursor::new(bytes)).decode()?;

And save them using save or write_to methods:"empty.jpg")?;

let mut bytes: Vec<u8> = Vec::new();
img2.write_to(&mut bytes, image::ImageOutputFormat::Png)?;

With default features, the crate includes support for many common image formats.

Image buffers

The two main types for storing images:

  • ImageBuffer which holds statically typed image contents.
  • DynamicImage which is an enum over the supported ImageBuffer formats and supports conversions between them.

As well as a few more specialized options:

  • GenericImage trait for a mutable image buffer.
  • GenericImageView trait for read only references to a GenericImage.
  • flat module containing types for interoperability with generic channel matrices and foreign interfaces.

Low level encoding/decoding API

The ImageDecoder and ImageDecoderExt traits are implemented for many image file formats. They decode image data by directly on raw byte slices. Given an ImageDecoder, you can produce a DynamicImage via DynamicImage::from_decoder.

ImageEncoder provides the analogous functionality for encoding image data.


pub use crate::error::ImageError;
pub use crate::error::ImageResult;
pub use crate::flat::FlatSamples;



Decoding and Encoding of BMP Images

Iterators and other auxiliary structure for the ImageBuffer type.

Encoding and decoding for various image file formats.


Decoding of DDS images


Decoding of DXT (S3TC) compression

Contains detailed error representation.


Decoding of farbfeld images

Image representations for ffi.


Decoding of GIF Images


Decoding of Radiance HDR Images


Decoding and Encoding of ICO files

Image Processing Functions

Input and output of images.


Decoding and Encoding of JPEG Images

Mathematical helper functions and types.


Decoding and Encoding of PNG Images


Decoding and Encoding of netpbm image formats (pbm, pgm, ppm and pam)


Decoding and Encoding of TGA Images


Decoding and Encoding of TIFF Images


Decoding of WebP Images


BGR colors

BGR colors + alpha channel

The delay of a frame relative to the previous one.

A single animation frame

An implementation dependent iterator, reading the frames as requested

Generic image buffer

Grayscale colors

Grayscale colors + alpha channel

Immutable pixel iterator

Represents the progress of an image operation.

RGB colors

RGB colors + alpha channel

A View into another image


An enumeration over supported color types and bit depths

A Dynamic Image

An enumeration of color types encountered in image formats.

An enumeration of supported image formats. Not all formats support both encoding and decoding.

An enumeration of supported image formats for encoding.


AnimationDecoder trait

Types which are safe to treat as an immutable byte slice in a pixel layout for image encoding.

A trait for manipulating images.

Trait to inspect an image.

The trait that all decoders implement

Specialized image decoding not be supported by all formats

The trait all encoders implement

A generalized pixel.

Primitive trait from old stdlib


Guess image format from memory block

Read the dimensions of the image located at the specified path. This is faster than fully loading the image and then getting its dimensions.

Create a new image from a Reader

Create a new image from a byte slice

Create a new image from a byte slice

Open the image located at the path specified. The image’s format is determined from the path’s file extension.

Saves the supplied buffer to a file at the path specified.

Saves the supplied buffer to a file at the path specified in the specified format.

Type Definitions

Sendable grayscale + alpha channel image buffer

Sendable grayscale image buffer

Sendable Rgb image buffer

Sendable Rgb + alpha channel image buffer