convert jpx to jpeg

@@ -96,6 +96,12 @@ class PDFHandler:
     def extract_single_image(self, pdf, xref, smask, colorspace, pno, img_index=0):
         pix = self.recover_pix(pdf, xref, smask, colorspace)
         ext, img_data = self.get_img_data(pix)
+        if ext == 'jpx':
+            img_save_path = self.get_img_save_path(pno, img_index=img_index)
+            jpx_pix = fitz.Pixmap(img_data)
+            jpx_pix.writeImage(img_save_path)
+            jpx_pix = None
+        else:
             img_save_path = self.get_img_save_path(pno, img_index=img_index, ext=ext)
             with open(img_save_path, "wb") as f:
                 f.write(img_data)