Times change, and so do standards. What used to be the standard of internet web graphics now has to be replaced with a new file type. "PNGs uses the deflate compression algorithm typically with a 32KB sliding window. Deflate is an improved version of the Lempel-Ziv compression algorithm (LZ77) used in ZIP and GZIP files (3,4). Created by Phil Katz for version 2 of PKZip, deflate combines LZ77 with Huffman encoding and is 10% to 30% more efficient than LZW at lossless compression. Like gzip, some PNG compression tools have an optional "compression
This page is intended to provide an explanation of some of the features of the PNG format for non-technical users. As such, it doesn't emphasize PNG features like freedom from patents; those are more of concern to developers. Where programmer information is given, it is principally to explain to the user why various applications may not perform as well as expected. Where performance claims are made--especially compression comparisons with other image formats--we assume that the PNG implementation is at least as good as the best freeware encoders. Note
This page is intended to provide an explanation of some of the features of the PNG format for non-technical users. As such, it doesn't emphasize PNG features like freedom from patents; those are more of concern to developers. Where programmer information is given, it is principally to explain to the user why various applications may not perform as well as expected. Where performance claims are made--especially compression comparisons with other image formats--we assume that the PNG implementation is at least as good as the best freeware encoders. Note
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