Portable Network Graphics

(redirected from PNG format)

Portable Network Graphics

(file format)
/ping/ (PNG) An extensible file format for the lossless, portable, well-compressed storage of raster images. PNG provides a patent-free replacement for GIF and can also replace many common uses of TIFF. Indexed-colour, greyscale and truecolour images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits.

PNG is designed for on-line viewing applications, such as the World Wide Web, so it is fully streamable with a progressive display option. PNG is robust, providing both full file integrity checking and simple detection of common transmission errors. Also, PNG can store gamma correction and chromaticity data for improved colour matching on heterogeneous platforms.

Filename extension: .png.

RFC 2083. W3C PNG pages. PNG home page.
Mentioned in ?
References in periodicals archive ?
Photograph files must be JPEG or PNG format and no larger than 1MB.
Entries can be submitted as sketches, illustrations, graphic designs or photographs in JPEG or PNG format no larger than 2MB in size.
com/topps, choose a card format from among three options, upload images in a jpeg, gif, tiff, or png format, and enter the specific information they want on the card, including player's team, player's name, position, season and coach's name.
With buttons, logos, drawings, diagrams and cartoons, either the GIF or newer PNG format, is typically faster loading than JPEG.
With buttons, logos, drawings, diagrams and cartoons, either the GIF format or the newer PNG format typically load faster than JPEGs.
Photographe files must be JPEG or PNG format and no larger than 1MB.
Save single pages as a PNG format to your photo library;
Spammers have also started using images in PNG format, where previously they were using only GIF images.
0 is the first web graphic optimization utility to support the PNG format, and also provide simulated Internet Explorer and Netscape browser environments for previewing optimized web graphics.
As a result of those efforts, CompuServe has determined that the PNG format closely meets the future requirements for graphics interchange on the Internet, on CompuServe and on other services.
In keeping with Knowledge Impact's open design philosophy, captured and authored data is stored in XML format and images are stored in PNG format.
Robust image optimization capabilities - provides automatic intelligent conversion of GIF images to JPEG or PNG format, five levels of PNG or JPEG optimization, image tag rewriting, and the integration of improved optimization libraries for better response time and improved image quality -- Tunable text compression - supports HTML and MIME text context compression with real-time adaptation to browser capabilities -- Comprehensive protocol optimization and management - allows source IP preservation, provides delivery optimization, supports HTTP 1.