| Lee Daniel Crocker | |
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Lee Daniel Crocker at Free Culture Conference, 2008
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| Born |
Lee Daniel Crocker July 3, 1963 Valdosta, Georgia, United States |
| Nationality | United States |
| Occupation | Computer Programmer |
| Website | etceterology |
He was involved in the creation of the GIF, JPEG, and PNG image file formats, and appears as a co-author of the PNG specification. He invented the per-scanline variable pre-filtering compression method used by PNG, the sum-of-abs heuristic used by many encoding programs, and proposed an early version of the Adam7 algorithm, using 5 passes rather than 7. In 1998, he was one of the 23 original creators of the "Transhumanist Declaration". As of 1999, he was a member of the Extropians' futurist society.