RLE/ PackBits Compression

RLE is an acronym for Run Length Encoding. Images frequently contain the same character repeated many times in a row. For example, text files use multiple spaces to separate sentences, indent paragraphs, format tables & charts, etc. Images can also have runs of the same pixel color. A perfect example of this would be a document image: the white background would create very long runs in certain areas of the image.

A flavor of RLE compression used in TIFF files is PackBits. PackBits uses a control byte to indicate how the next byte or run of bytes to be used. The high bit in the control byte indicates if the following byte or bytes should be a run or as they are. The lower 7 bits indicate the count of bytes - 1. For example, if you have an image with the following values 2,3,2,4,4,4,4,4: The output after being compressed would look something like this: 2 ,2,3,2, -4 , 4. (The control bytes are bold.)

Supported compression formats click below for information on compression formats available in the LEADTOOLS SDKs

LEADTOOLS offers more compression options than any other toolkit on the market. LEADTOOLS supports industry standard and proprietary alternative compression algorithms including:

• ±JPEG2000
• JPEG
• LEAD CMP
• LZW
• RLE / PackBits
• ZIPLIB
• CCITT G3/G4
• Huffman
• Arithmetic
• ±JBIG
• ±LEAD CMW
• LEADTOOLS ABC
• ±JBIG2
• ±ABIC

RLE compression is available in the following products See the list above for more information on which formats are supported in each toolkit.

Pricing Structure

Product	Price	Purchase	Try
#LEADTOOLS Imaging	$495		Free Trial
†LEADTOOLS Imaging Pro	$995		Free Trial
*LEADTOOLS Document Imaging	$2495		Free Trial
*LEADTOOLS Recognition	$3995		Free Trial
*LEADTOOLS Document Imaging Enterprise	$4995		Free Trial
*LEADTOOLS Medical Imaging	$4995		Free Trial
*LEADTOOLS PACS Imaging	$7995		Free Trial

†Hybrid License. License includes development seat, application license, unlimited internal deployment and up to 1000 commercial desk top deployments/5 commercial production server deployments per year. Annual and multi-year unlimited deployment licenses are available for commercial deployment. Please contact oemsales@leadtools.com or call a LEAD sales representative with any questions. Click here for more information on LEADTOOLS License Agreement.

* Deployment requires runtime license. Marked toolkits require runtime licensing based on the deployment of the application you develop. Several purchase options are available. For more information, please contact oemsales@leadtools.com or call a LEAD sales representative. Click here for more information on LEADTOOLS Runtime Licensing requirements.