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What is PNG and how does it work?

PNG is designed to work well in online viewing applications, such as the World Wide Web, so it is fully streamable with a progressive display option. PNG is robust, providing both full ?le integrity checking and simple detection of common transmission errors.

Is image/png the Internet media type for PNG?

The PNG authors intend to register “ image/png” as the Internet Media Type for PNG [RFC-1521, RFC- 1590]. At the date of this document, the media type registration process had not been completed. It is rec- ommended that implementations also recognize the interim media type “ image/x-png”.

What is the fastest way to display PNG images?

In many cases, decoders will treat image data in PNG ?les as device-dependent RGB data and display it without modi?cation (except for appropriate gamma correction). This provides the fastest display of PNG images.

What is the code for a PNG file?

In the Apple Macintosh system, the following conventions are recommended: The four-byte ?le type code for PNG ?les is “PPNGf”. (This code has been registered with Apple for PNG ?les.) The creator code will vary depending on the creating application.