👁 Image
JBig2Decoder.NETStandard 1.5.2

JBig2Decoder.NETStandard

Converts a JBIG2 (*.jb2) image to a RGB byte array. JBIG2 images offer lossless compression for bi-level (black and white) images. The spec was released in 2000, at the peak of fax machine technology.

There are no package dependencies and it is compiled for:

1. .NET 8.0
2. .NET 6.0
3. .NET Standard 2.0
4. .NET Framework 4.8

Usage

string file = "pic.jb2";
var input = File.ReadAllBytes(file);
var jbig = new JBIG2StreamDecoder();
int width = 0;
int height = 0;
byte[] output = jbig.DecodeJBIG2(input, out width, out height);
// the resulting 'byte[] output' is a RGB array

// Then the bytes can be converted to an image using your favorite image processing library.
// To convert to a png using ImageSharp:
var image = Image.LoadPixelData<Rgb24>(output, width, height);
image.SaveAsPng("pic.png");

Versions

• 1.5.2 - Robust improvements for malformed streams and license updates.

• 1.5.1 - Negative bug fix

• 1.5.0 - .NET 8

• 1.4.0 - All package dependencies removed and only a byte array is created

• 1.3.0 - All libraries converted to .NET Standard 2.0

Original History

• JBig2Decoder.NETCore by Winking https://github.com/winkingsoftware/JBig2Decoder.NETCore

• Which is from JBig2Decoder.NET by devteamexpress https://github.com/devteamexpress/JBig2Decoder.NET/tree/master/JBig2Decoder

• Which is a .NET Port of the java JPedal JBig2Decoder Implementation.

NuGet

https://www.nuget.org/packages/JBig2Decoder.NETStandard/

github

@nicholsab