JBIG2: Overview

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JBIG2 is an image compression standard for bi-level images and it is suitable for both lossless and lossy compression.

JBIG2 compression in lossless mode can compress bi-level image 2-5 times effectively than CCITT Fax Group 4 compression.
JBIG2 compression in lossy mode can compress bi-level image 5-10 times effectively than CCITT Fax Group 4 compression.

VintaSoft JBIG2 .NET Plug-in has a set of classes for easy manipulation with JBIG2 images.

Jbig2File class

Jbig2File class allows to:

create new JBIG2 file on disk or in stream
open an existing JBIG2 file from disk or stream
get access to the collection of JBIG2 pages - Jbig2File.Pages
save changes in JBIG2 file - ImageFileBase.SaveChanges
save JBIG2 file to another file or stream - Jbig2File.Save
pack JBIG2 file to another file or stream - ImageFileBase.Pack

Here is C#/VB.NET code that shows how to create new JBIG2 file in big-endian format:

Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File jbig2Doc = 
    new Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File();

VB.NET

Dim jbig2Doc As New Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File()

Here is C#/VB.NET code that shows how to load an existing JBIG2 file:

Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File jbig2Doc = 
    new Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File("document.jb2");

VB.NET

Dim jbig2Doc As New Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File("document.jb2")

Jbig2PageCollection class

Jbig2PageCollection class allows to:

get number of pages in JBIG2 file - Jbig2PageCollection.Count
access page of JBIG2 file - Pages[i]
add page to JBIG2 file - Jbig2PageCollection.Add
insert page to JBIG2 file - ImagePageCollection.Insert
remove page from JBIG2 file - Jbig2PageCollection.Remove, Jbig2PageCollection.RemoveAt
remove all pages from JBIG2 file - Jbig2PageCollection.Clear

Here is C#/VB.NET code that shows how to load multipage JBIG2 file, add JPEG image to the end of JBIG2 file, insert PNG image at the beginning of JBIG2 file and remove third page from JBIG2 file:

Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File jbig2Doc = 
    new Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File("document.jb2");
jbig2Doc.Pages.Add(new Vintasoft.Imaging.VintasoftImage("image.jpg"));
jbig2Doc.Pages.Insert(0, new Vintasoft.Imaging.VintasoftImage("image.png"));
jbig2Doc.Pages.RemoveAt(2);
jbig2Doc.SaveChanges();

VB.NET

Dim jbig2Doc As New Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File("document.jb2")
jbig2Doc.Pages.Add(New Vintasoft.Imaging.VintasoftImage("image.jpg"))
jbig2Doc.Pages.Insert(0, New Vintasoft.Imaging.VintasoftImage("image.png"))
jbig2Doc.Pages.RemoveAt(2)
jbig2Doc.SaveChanges()

Jbig2Page class

Jbig2Page class allows to:

get information about image of JBIG2 page - Jbig2Page.Width, Jbig2Page.Height, Jbig2Page.BitsPerPixel, Jbig2Page.Resolution, Jbig2Page.Palette
get image of JBIG2 page - Jbig2Page.GetImage
save image of JBIG2 page to file or stream - Jbig2Page.Save

Here is C#/VB.NET code that shows how to get the first page of JBIG2 file as Image:

Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File jbig2Doc = 
    new Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File("document.jb2");
Vintasoft.Imaging.VintasoftImage pageImage = jbig2Doc.Pages[0].GetImage();

VB.NET

Dim jbig2Doc As New Vintasoft.Imaging.Codecs.ImageFiles.Jbig2.Jbig2File("document.jb2")
Dim pageImage As Vintasoft.Imaging.VintasoftImage = jbig2Doc.Pages(0).GetImage()

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