To enable JP2 file format in your project, add a reference to ImageGear20.Formats.Jpeg2000 Assembly. Specify this directive:

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using ImageGear.Formats.Jpeg2000;

and use this API:

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ImGearFileFormats.Filters.Add( ImGearJPEG2K.CreateJP2Format());

See the JPEG2000 section of the ImageGear Supported File Formats Reference for a list of bit depths and colorspaces supported for reading and writing.