[WSG] PNG support cross browser

2006-09-05 Thread Tony Crockford
I understand the limitations of alpha transparency and 24 bit png, but 
is it safe to use 8bit png in place of gif files?


which browsers won't display an 8bit png (no transparency, just for the 
smaller file size)?


a definitive table would be great...

I've searched, but info is either old or confusingly written.

TIA


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Re: [WSG] PNG support cross browser

2006-09-05 Thread Anders Nawroth



Tony Crockford skrev:
I understand the limitations of alpha transparency and 24 bit png, but 
is it safe to use 8bit png in place of gif files?


You can get problems with colors not matching between PNG and HTML/CSS 
colors. It has to do with Gamma values, read more here:


The Sad Story of PNG Gamma Correction
http://hsivonen.iki.fi/png-gamma/


/AndersN


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Re: [WSG] PNG support cross browser

2006-09-05 Thread porneL
On Tue, 05 Sep 2006 18:19:00 +0100, Jesse Skinner  
[EMAIL PROTECTED] wrote:



Anders Nawroth wrote:
You can get problems with colors not matching between PNG and HTML/CSS  
colors. It has to do with Gamma values, read more here:


I haven't experimented with this myself, but I understand you can use a  
utility such as 'pngcrush' to remove the gamma information (and reduce  
the file size), and this fixes the color mismatch.


I recommend PNGOUT - http://advsys.net/ken/utils.htm (Mac OS X and Linux  
versions are available - http://jonof.edgenetwork.org/index.php?p=pngout)


It's slower than pngcrush/optipng, but has excellent compression and  
removes problematic gamma information in the process.


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regards, porneL


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