CCITT G3/G4 Image Compression SDK Libraries

Several of the more than 150 formats supported by LEADTOOLS libraries for .NET (C#, VB, Core, Xamarin, UWP), C, C++, iOS, macOS, Linux, Java, and web developers use CCITT Group3 and Group4 industry standards to compress bitonal (1-bit) image data. Both the Group3 and Group4 standards encode the source image line by line. The difference between the two algorithms is in the way the two handle successive scan lines.

Feature-rich CCITT G3/G4 Image Compression SDK

CCITT G3/G4 Image Compression Libraries

The LEADTOOLS libraries can load and save CCITT G3/G4 compressed image data in many formats including TIFF, PDF, and Intergraph. Further, LEADTOOLS libraries can keep 1-bit image data CCITT compressed in memory, which reduces the application's memory footprint.

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Comparison of Bitonal Compressions

CCIT G3 versus G4

Differences Between CCITT G3 and G4 Compressions

In Group3-1D, each scan line is encoded independently, whereas in Group4, scan lines are encoded with reference to the previous line, resulting in improved compression ratios. In Group3-1D, a scan line is encoded as a set of runs. Each run represents a number of white or black pixels, with white runs alternating with black runs. Every run is encoded using a variable number of bits that can be uniquely identified upon decoding. This means that frequently occurring lengths of run may be encoded very efficiently, while infrequent ones cause the data to grow. For example, a white run of 2 or 3 pixels can be encoded using just 2 bits, while a run of 1000 pixels can be encoded in 25.

Group4 encoding is more complex when compared to Group3 encoding. Each scan line is compared with the previous one. Because of this, vertical features in the source image can be used to achieve better compression ratios.

There is also a Group3-2D algorithm. Group3-2D is a combination of Group3-1D and Group4 compression schemes.

Versatile and robust CCITT G3/G4 Image Compression Libraries

Superior Compression Algorithms

LEADTOOLS is the premier choice to compress and decompress images. It supplies broad support for a host of industry-standard compression algorithms. LEADTOOLS also has advanced and proprietary compression techniques that result in smaller files with better quality. Because LEADTOOLS is the only toolkit that has these options, your product will have an edge to beat the competition.

Proprietary Alternatives:

CCITT G3/G4 Image Compression Development Made Easy

Easy to Integrate

LEADTOOLS handles the heavy lifting — eliminating months of R&D, while giving you the best quality and performance available. This leaves you free to focus on other components of your application. Download the evaluation and start coding to get an idea of how much more streamlined your development will be using LEADTOOLS.

Cross platform libraries

CCITT G3/G4 Image Compression SDK Platforms and Programming Interfaces

Projects that use LEADTOOLS CCITT G3/G4 Image Compression libraries can be deployed to web browsers, Windows, macOS, iOS, Android, and Linux devices.

CCITT G3/G4 Image Compression SDK libraries are available for

Start Coding With LEADTOOLS CCITT G3/G4 Image Compression


CCITT G3/G4 Image Compression libraries for Windows, Linux, and macOS as well as all LEADTOOLS Recognition, Document, Medical, Vector, and Imaging technologies for all development and target platforms.

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Online Demo Application that include CCITT G3/G4 Image Compression SDK Libraries


HTML5/JavaScript Viewer

Demonstrates the features of the LEADTOOLS HTML5/JavaScript image viewer. Features include:

  • Load an image from url
  • Rotate
  • Zoom
  • Flip horizontally and vertically