Aspose.Imaging API can easily convert from J2K(Wavelet Compressed Image) to other formats using Java platform...J2K to EMZ J2K to WMZ J2K to TGA J2K to SVGZ J2K to CANVAS J2K...
You can use Aspose.Imaging for Python via .NET library to convert from a variety of formats to JPEG2000...to JPEG2000 PNG to JPEG2000 TGA to JPEG2000 TIF to JPEG2000 TIFF...