We used a picture from Bonnie's Bookstore game to test PNG, JPEG and JPEG2000 compression.

 You can visually compare JPEG2000 and old JPEG:



The original image has 800×600 resolution with 24-bit color and its uncompressed size is 1,440,000 bytes.

JPEG2000 image was created with the Fnord Photoshop plug-in.