Differences between version 7 and predecessor to the previous major change of PNG.
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| Newer page: | version 7 | Last edited on Thursday, September 4, 2003 11:31:12 am | by JohnMcPherson | Revert |
| Older page: | version 2 | Last edited on Thursday, June 5, 2003 12:13:41 am | by PerryLorier | Revert |
@@ -1,5 +1,5 @@
-Short
for Portable Network Graphics, and pronounced ping
, a new bit-mapped
graphics format similar to GIF
. In fact, PNG was
approved as a standard
by the World Wide Web consortium to replace
GIF because GIF uses
a patented data
compression algorithm called LZW. In contrast, PNG is completely
patent- and license-
free. The most recent versions of NetscapeNavigator
and Microsoft InternetExplorer now support PNG
+PNG (pronounced "ping") is the [Acronym]
for Portable Network Graphics, a new, losslessly compressed bitmapped
graphics format. It is
approved by the [
World Wide Web consortium|W3C] as the successor of the [
GIF] format. The latter depends on
a compression algorithm called LZW which was patented by [Unisys] long ago
. In contrast, PNG relies on the
patent free LZSS algorithm for compression
and is completely unencumbered with licensing fees.
-PNG is an
[Acronym
]
-
- Rumours include
that the IE engine is pretty
old an
out of date and can't
support it
without lots of hidious
hacks.
Amusingly, while Microsoft can't make these hidious
hacks, we can. Here's a site
that explains how to properly render PNG's in IE
with alpha transparency:
http://redvip
.homelinux
.net/varios
/explorer
-png
-en
.html
+Recent versions of
[Mozilla], [Opera], and [Microsoft
] InternetExplorer support PNG, although the latter
doesn't support alpha channels natively
. Rumour has it
that the IE engine is too
old and
out of date to
support transparency
without lots of hideous
hacks. Amusingly(?)
, while Microsoft can't make these hideous
hacks, [
we can|http://support
.microsoft.com/default.aspx?scid=kb;en-us;Q294714]. Since
that way is completely incompatible
with every other browser on the world, you should [use a slightly different approach|
http://webfx
.eae
.net/dhtml
/pngbehavior/pngbehavior.html].
+
----
+See also: pngcrush(1), a [Free] program to make your PNG files as small as possible, either lossless or lossy depending on what arguments you give it
.
