File Formats: JPX

The JPX file format is part of the JPEG 2000 standard and uses a hierarchical format to store several resolutions of the image in the same file without duplication. JPX files use a .jpx file extension. This wavelet-based image compression format is especially useful for document, medical, and satellite imagery archiving systems.

All LEADTOOLS Imaging Pro, Document Imaging, and Medical Imaging toolkits can read/parse JPX files.  LEADTOOLS Document and Medical Imaging toolkits also add support for writing/saving JPX files and manipulating JPX boxes, frames, GML Data, and other advanced JPX features.

For general information, refer to Compression Using LEAD and JPEG Formats. For instructions for implementing progressive formats, refer to Controlling Progressive Loads and Saves. JPEG and LEAD files can contain many comment fields of various types. Use the LFile::ReadComment  function to read comments in an existing file. Before writing a file, use the LFileSettings::SetComment function to create an array of comments to be saved in the file.

Please note that the LTCLR DLL is required for loading JPEG CMYK images and for loading and saving JPEG LAB images.

File constants associated with this file format are:


Read Support

Write Support



8, 12, 16 BPP (grayscale)

24, 32, 48, 64  BPP (color)

8, 12, 16 BPP (grayscale)

24, 32, 48, 64  BPP (color)

[323] JPEG 2000 Extension (Part 2).

Required 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: JPG, J2K, JP2, JPM, JLS, CMP, and CMW - JPEG and LEAD Compressed Formats, EXIF - Exif Formats, FPX - Kodak Format, TIFF / BigTIFF - Tagged Image File Format.


Win32, x64.

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