The PNG Guide is an eBook based on Greg Roelofs' book, originally published by O'Reilly.


Opera, the small-footprint, high-speed browser from Norway, is by some measures[15] the third most popular browser for the Windows 3.x and 95/98/NT platforms. Native ports to the Amiga, BeOS, Macintosh, OS/2, Psion, and Unix are also underway. Version 3.0 had no PNG support at all, while version 3.5 supported it only through old-style Netscape plug-ins (i.e., with no transparency support). Version 3.51, released in December 1998, includes native PNG support. Opera displays PNG images progressively and does gamma correction, but like Navigator, it does not invoke its internal image handlers for images in OBJECT tags. Transparency, unfortunately, is only partly supported. Truecolor and grayscale images with alpha channels are rendered completely opaque; most palette images are rendered with binary transparency, although at least one palette-based example exists in which the image is rendered without any transparency.

[15] BrowserWatch statistics, anyway (

Opera is available from the Opera Software home page, News on the non-Windows ports can be found at

Last Update: 2010-Nov-26