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1. High ratio compression:   The followings are image quality comparison at high compression ratio using Kodak testing image Birds (768*512*24). The highest compression ratio which JPEG can reach is 150:1. The highest ratio Google WebP can reach is 250:1. In contrast, Lucid can reach 500:1 or even higher.  


Comparison at high ratio



(1). JPEG (150 :1 ):

JPEG (150:1)



(2). JPEG2000 (150 :1 ):

JPEG2000 (150:1)



(3). JPEG XR (150 :1 ):

JPEG XR (150:1)



(4). Google WebP (150 :1 ):

Google WebP (150:1)



(5). Lucid (150 :1 ):

Lucid (150:1)




2. Lossless compression:   In addition to the outstanding performance in lossy compression, Lucid performs lossless compression as excellent as JPEG2000. To the 24 Kodak testing images, performance differences between the two coders are less than 1% (+, -). We also can see that, Lucid may improve up to 25% than JPEG XR (previously called Microsoft HD Photo). Meanwhile, Lucid lossless may improve by 80% (nearly double) than PNG. Google WebP lossless performs close to Lucid and JPEG2000, but runs much slower.

Comparison of Lossless Compression

Kodak images:  1-alfred, 2-beach, 3-birds, 4-boat, 5-country style, 6-girl, 7-golden ball, 8-hats, 9-house, 10-island, 11-knob bolt, 12-light home, 13-light house, 14-little red, 15-motorcycles, 16-mountain brook, 17-pier, 18-rafting, 19-red hood, 20-sailboat, 21-sailboats, 22-six shooter, 23-window, 24-wood brick.





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