Important new features of PNG, not available in GIF, include:
Complete hardware and platform independence. 
Ancillary information: textual comments and other data can be. Transparency: portions of the image can be marked as transparent,Ĭreating the effect of a non-rectangular image. Yielding a low-resolution image very quicklyįollowed by gradual improvement of detail. Progressive display: a suitably prepared image file can beĭisplayed as it is received over a communications link,. 
Protocol for on-the-fly generation and display of images. Serially, thus allowing the file format to be used as a communications
Streamability: files can be read and written. Indexed-color images of up to 256 colors. The design provides some useful new features not available in Unencumbered, well-compressed, well-specified standard forĪlthough the initial motivation for developing PNG was to replace GIF, The PNG format provides a portable, legally cHRM Primary chromaticities and white point This specification defines a proposed Internet Media Type Improved color matching on heterogeneous platforms. Simple detection of common transmission errors.Īlso, PNG can store gamma and chromaticity data for PNG is robust, providing both full file integrity checking and The World Wide Web, so it is fully streamable with a progressive PNG is designed to work well in online viewing applications, such as Grayscale, and truecolor images are supported, plus an optionalĪlpha channel. PNG provides a patent-free replacement for GIF andĬan also replace many common uses of TIFF. This document describes PNG (Portable Network Graphics), an extensibleįile format for the lossless, portable, well-compressed storage of raster The Consortium could in principle support some future activity. PNG Development Group, Consortium does not currently have plans to work on anyįuture versions of PNG, though were the necessity to arise,Īnd were an activity in that area to receive the support of Members, The Consortium staff have encouraged the development of PNG,Īs have Compuserve, Inc. This enhances the functionalityĪ list of current W3C Recommendations and other technical documents The Recommendation is to draw attention to the specification and to It is a stable document and may be used as reference material or citedĪs a normative reference from another document. Parties and has been endorsed by the Director as a W3C Recommendation. This document has been reviewed by W3C members and other interested REC-png.html PNG (Portable Network Graphics) Specification Version 1.0 W3C Recommendation 01-October-1996įor list of authors, see Credits (Chapter 19). PNG (Portable Network Graphics) Specification
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