You can use Aspose.Imaging for Python via .NET library to convert from a variety of formats to CANVAS...DNG to CANVAS EMF to CANVAS EMZ to CANVAS GIF to CANVAS JPEG2000...
Using Aspose.Imaging for .NET library it is easy to convert to J2K(Wavelet Compressed Image) from other supported image formats...to J2K DNG to J2K EMF to J2K EMZ to J2K GIF to J2K JP2 to J2K...