File Format ABC

LEADTOOLS ABC (Advanced Bitonal Compression), a proprietary 1-bit compression format developed by LEAD Technologies, is a major breakthrough in document capture technology. This set of advanced compression algorithms out performs all industry standard compression types. With LEADTOOLS ABC, customers will be able to realize file sizes 4 to 5 times smaller than the files sizes generated by standard 1-bit compression types such as CCITT Group 4. LEADTOOLS ABC was specifically designed to allow efficient network transmission of scanned manuals, books, check images and other document types. This superior compression allows the resulting images to be efficiently transmitted, viewed and manipulated over local area networks and the Internet. You can read and write files in this format.

The power behind LEADTOOLS ABC technology is LEAD's new LOSSLESS black and white image compression. LEAD Technologies has been an early leader in turning the latest advancements in image compression into productive, functional implementations for commercial use. In addition, this SDK supports compressed ABC in a TIFF file, as single page or multi-page TIFF. With ABC, there are also lossy options. You can specify the quality factor using theQualityFactor.

LEADTOOLS ABC helps companies optimize their scanned documents to save transmission/ bandwidth usage and server space, which in turn, results in savings of time and money. Many financial institutions such as banks and insurance companies back up their important documents by scanning them and archiving the resulting images to servers as TIFF files or other common bitonal file formats. Using LEADTOOLS ABC compression, server space can be significantly reduced, therefore eliminating the need for additional servers. In addition, if the images are being transmitted over the internet, the smaller file sizes will save transmission costs and time since smaller file sizes transmit much faster using less bandwidth.


Refer to the following chart to compare how LEADTOOLS ABC compares to the industry standard 1-bit compression formats!

For a list of products, refer to the Products Overview at

Note: LEADTOOLS ABC Read support is available in all products LEADTOOLS ABC Write support is available in LEADTOOLS Document Imaging and up.

The default extension used by this format is: ABC.

File constants associated with this file format are:


Read Support

Write Support





LEAD Advanced Bitonal Compression 1 bit, lossless compression.

Required DLL: Leadtools.Codecs.Abc.dll. For a listing of the exact DLLs needed, based on the toolkit version, refer to Files To Be Included With Your Application .

Related Formats: ABIC, CMP - LEAD 1-Bit Format, JBIG Format (jbg), JBIG2 Format (jb2), FAX - Raw Fax Format, TIFF - Tagged Image File Format / CCITT.

Platforms: .NET 2/3, .NET 4

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