Portable Network Graphics: Raster Graphics, Image File Formats, Lossless Data Compression, Graphics Interchange Format, Recursive Acronym, RGB Color Model, Usenet Newsgroup

Portable Network Graphics: Raster Graphics, Image File Formats, Lossless Data Compression, Graphics Interchange Format, Recursive Acronym, RGB Color Model, Usenet Newsgroup

High Quality Content by WIKIPEDIA articles! Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image-file format not requiring a patent license. It is pronounced /?p??/ or spelled out as P-N-G. The PNG acronym is optionally recursive, unofficially standing for ?PNG’s Not GIF?. PNG supports palette-based (palettes of 24-bit RGB or 32-bit RGBA colors), greyscale, RGB, or RGBA images. PNG was designed for transferring images on the Internet, not professional graphics, and so does not support other color spaces (such as CMYK).

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Microsoft Research C#UNG Image of Usenet Newsgroup Reply Social Network

Microsoft Research C#UNG Image of Usenet Newsgroup Reply Social Network
server usenet
Image by Marc_Smith
[UPDATE: now see NodeXL: www.codeplex.com/nodexl for more recent versions]

This is a directed graph visualization based on data collected from the Netscan project at Microsoft research from Usenet newsgroup message traffic. In this image the dots are "nodes" representing authors or "posters" in a newsgroup about server operating systems for computers. The dots are connected by lines or "edges" representing the relationship "replied to".

The image highlights the variation in roles and social structure in newsgroups and other online discussion communities.

The C#UNG software that generated the image is freely available from research.microsoft.com. It comes with an Excel plug-in that allows users to generate their own network visualizations with any data they can get into a spreadsheet (that contains a properly formatted directed graph data structure). Your mileage may vary. Netscan can be found at netscan.research.microsoft.com.

Smith, Marc A., Researcher at Microsoft Corporation, 2007. Netscan: A Social Accounting Search Engine, Microsoft Research Community Technologies Group, netscan.research.microsoft.com