If your document image quality is good after you resize the image document for the web saving a quality 10 Jpeg image should decode with good image quality. What are you exact Photoshop steps the produce the unacceptable image file.
JPEG 2000 - Wikipedia, the free encyclopedia
JPEG 2000 has been published as an ISO standard, ISO/IEC 15444. As of 2013, JPEG 2000 is not widely supported in web browsers, and hence is not generally used on the Internet.