To enable JPX file format in your project, add a reference to ImageGear21.Formats.Jpeg2k Assembly. Specify this directive:

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using ImageGear.Formats.JPEG2K;

and use this API:

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ImGearFileFormats.Filters.Add( ImGearJPEG2K.CreateJPXFormat());

See the JPX section of the ImageGear Supported File Formats Reference for a list of bit depths and colorspaces supported for reading and writing.