For Scribus, I assume you are using this.
http://wiki.scribus.net/canvas/How_to_Is..._text_flow
I do know that Gimp 3 can import a clipping path in a photoshop jpeg . I do not think Gimp 3 can export that yet, but I might be wrong.
I do not know about jpeg2k format but try a tiff. This showing Gimp 3.1.4 (appimage) and the inset is it open in an ancient PS7.
http://wiki.scribus.net/canvas/How_to_Is..._text_flow
I do know that Gimp 3 can import a clipping path in a photoshop jpeg . I do not think Gimp 3 can export that yet, but I might be wrong.
I do not know about jpeg2k format but try a tiff. This showing Gimp 3.1.4 (appimage) and the inset is it open in an ancient PS7.