You can use Aspose.Imaging for Python via .NET library to convert from a variety of formats to CANVAS...PNG to CANVAS TGA to CANVAS TIF to CANVAS TIFF to CANVAS WEBP...
Using Aspose.Imaging for .NET library it is easy to convert to J2K(Wavelet Compressed Image) from other supported image formats...to J2K PNG to J2K TGA to J2K TIF to J2K TIFF to J2K WEBP to J2K...