C# Other
JimBobSquarePants Merge pull request #676 from SixLabors/js/defect-675
Fix 1 bit bmp decoding and add extra test images.
Latest commit c49b031 Aug 14, 2018



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ImageSharp is a new, fully featured, fully managed, cross-platform, 2D graphics API.

Designed to democratize image processing, ImageSharp brings you an incredibly powerful yet beautifully simple API.

Compared to System.Drawing we have been able to develop something much more flexible, easier to code against, and much, much less prone to memory leaks. Gone are system-wide process-locks; ImageSharp images are thread-safe and fully supported in web environments.

Built against .Net Standard 1.1 ImageSharp can be used in device, cloud, and embedded/IoT scenarios.


For all SixLabors projects, including ImageSharp: https://sixlabors.github.io/docs/


Install stable releases via Nuget; development releases are available via MyGet.

Package Name Release (NuGet) Nightly (MyGet)
SixLabors.ImageSharp NuGet MyGet
SixLabors.ImageSharp.Drawing NuGet MyGet


The ImageSharp library is made up of multiple packages:

  • SixLabors.ImageSharp

    • Contains the generic Image<TPixel> class, PixelFormats, Primitives, Configuration, and other core functionality.
    • The IImageFormat interface, Jpeg, Png, Bmp, and Gif formats.
    • Transform methods like Resize, Crop, Skew, Rotate - Anything that alters the dimensions of the image.
    • Non-transform methods like Gaussian Blur, Pixelate, Edge Detection - Anything that maintains the original image dimensions.
  • SixLabors.ImageSharp.Drawing

    • Brushes and various drawing algorithms, including drawing images.
    • Various vector drawing methods for drawing paths, polygons etc.
    • Text drawing.

Build Status

Build Status Code Coverage
Linux/Mac Build Status Code coverage
Windows Build Status Code coverage



Our API is designed to be simple to consume. Here's an example of the code required to resize an image using the default Bicubic resampler then turn the colors into their grayscale equivalent using the BT709 standard matrix.

On platforms supporting netstandard 1.3+

// Image.Load(string path) is a shortcut for our default type. 
// Other pixel formats use Image.Load<TPixel>(string path))
using (Image<Rgba32> image = Image.Load("foo.jpg"))
    image.Mutate(x => x
         .Resize(image.Width / 2, image.Height / 2)
    image.Save("bar.jpg"); // Automatic encoder selected based on extension.

On netstandard 1.1 - 1.2

// Image.Load(Stream stream) is a shortcut for our default type.
// Other pixel formats use Image.Load<TPixel>(Stream stream))
using (FileStream stream = File.OpenRead("foo.jpg"))
using (FileStream output = File.OpenWrite("bar.jpg"))
using (Image<Rgba32> image = Image.Load(stream))
    image.Mutate(x => x
         .Resize(image.Width / 2, image.Height / 2)

Setting individual pixel values can be performed as follows:

// Individual pixels
using (Image<Rgba32> image = new Image<Rgba32>(400, 400))
    image[200, 200] = Rgba32.White;

Rgba32 is our default PixelFormat, equivalent to System.Drawing Color. For advanced pixel format usage there are multiple PixelFormat implementations available allowing developers to implement their own color models in the same manner as Microsoft XNA Game Studio and MonoGame.

For more examples check out:

Manual build

If you prefer, you can compile ImageSharp yourself (please do and help!)

Alternatively, you can work from command line and/or with a lightweight editor on both Linux/Unix and Windows:

To clone ImageSharp locally click the "Clone in Windows" button above or run the following git commands.

git clone https://github.com/SixLabors/ImageSharp

How can you help?

Please... Spread the word, contribute algorithms, submit performance improvements, unit tests, no input is too little. Make sure to read our Contribution Guide before opening a PR.

The ImageSharp Team

Grand High Eternal Dictator

Core Team


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