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Chapter 16. PNG Format > PNG Compression

16.3. PNG Compression

The most notable aspect of PNG compression is that it is "lossless," meaning no information is lost in the compression process. A decompressed PNG image will be identical to the original.

PNGs use a "deflate" compression scheme. Like GIFs, PNG's compression works on rows of pixels, taking advantage of repetition in bytes of information. By use of filters (discussed in the next section), it can take advantage of some vertical patterns as well; however, filters are not recommended for use with palette images. PNG's compression engine typically compresses images 5-25% better than GIF.


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