You can use Aspose.Imaging for Python via .NET library to convert from a variety of formats to PSD...PSD EMZ to PSD GIF to PSD JPEG2000 to PSD JP2 to PSD J2K to PSD...
Aspose.Imaging API can easily convert from J2K(Wavelet Compressed Image) to other formats using Java platform...to JPEG J2K to JP2 J2K to JPEG2000 J2K to PNG J2K to APNG J2K...