Search Results for "lossless compression"

PNG is a file format used especially for images. It is a free file format, meaning that it can be used by everyone in any way he wants it without paying any royalties to anyone. But this is not the main advantage of PNG, I would even call it a minor advantage, as the end-users do not quite feel it. The PNG format was intended to be a replacement for the older PNG format and, in some ways, to the TIFF format. It's mainly used in two areas: World Wide Web and image-editing. On the Web, PNG is much better that GIF. It has included

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

Most of us have heard about PNG by now, but few developers are using it on the Web due to the uneven support within the various Web browsers. The format was developed as a result of the Unisys/GIF controversy and the need to overcome the limitations of both the GIF and JPEG formats. Macromedia has adopted PNG as the native format for its Fireworks product, yet most users are still converting images for the Web to GIF and JPEG. The next generation of browsers promise more complete support for all the features of this format, but one must wonder if it

The PNG format provides a portable, legally unencumbered, well-compressed, well-specified standard for lossless bitmapped image files. Although the initial motivation for developing PNG was to replace GIF, the design provides some useful new features not available in GIF, with minimal cost to developers. GIF features retained in PNG include: * Indexed-color images of up to 256 colors. * Streamability: files can be read and written serially, thus allowing the file format to be used as a communications protocol for on-the-fly generation and