December 2002
Intermediate to advanced
454 pages
25h 39m
English
Content preview from Lossless Compression Handbook
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CHAPTER 19 / PNG LOSSLESS IMAGE COMPRESSION
385
Table 19.2 Waterloo GreySetl (256 • 256)
Image GIF Standard PNG
Name (bytes) (bytes) vs GIF
"Optimal" PNG Compression
(bytes) vs GIF vs PNG Filters Level Strategy
Bird 47,516 32,474 -31.7% 31,448 -33.8% -3.2% All 2 Huffman
Bridge 76,511 48,511 -36.6% 48,451 -36.7% -0.1% All 9 Filtered
Camera 55,441 38,248 -31.0% 38,087 -31.3% -0.4% All 2 Huffman
Circles 1,576 1,829 +16.1% 1,117 -29.1% -38.9% 0 9 Filtered
Crosses 1,665 2,000 +20.1% 1,365 -18.0% -31.8% 2 9 Default
Goldhill 68,450 44,941 -34.3% 44,850 -34.5% -0.2% All 2 Huffman
Horiz ...
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