PNG (Portable Network Graphics) ?

can any one tell me what is PNG ?

how can this help me ?
some of the website can onsite create a gif or jpg file with ur name and send to us by mail or we save the gif down..
how they do this.... is this related to PNG ?


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MindoConnect With a Mentor Commented:
PNG  is the Portable Network Graphics format, a format for storing images on

I think you should go to their main site and read the history of this thing (follow link below). I'll put down the features of PNG:

multiple CRCs so that file integrity can be checked without viewing

ultra-clever magic signature that can detect the most common types of file corruption

better compression than GIF, typically 5% to  25% (but often 40% or 50% better on tiny images)
non-patented (you betcha!), completely lossless compression

majorly gnarly two-dimensional interlacing scheme
1-, 2-, 4- and 8-bit palette support (like GIF)
1-, 2-, 4-, 8- and 16-bit grayscale support
8- and 16-bit-per-sample (that is, 24- and 48-bit) truecolor support

full alpha transparency in 8- and 16-bit modes, not just simple on-off transparency like GIF

``palette-alpha'' mode, effectively transforming normal RGB palette into RGBA

gamma correction for cross-platform ``brightness'' control
color correction for cross-platform, precision color

both compressed and uncompressed text chunks for copyright and other info

full Year 2000 (Y2K) support, and then some (good for at least 63 millenia! yowza!)

free and complete reference implementation with full source code

The PNG Home Site is:
History, News, other useful stuff.
loongAuthor Commented:
thank for reply to me..

i still not understand why we need PNG
if we can create a gif in photoshop
can we create a gif file on the site ?
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