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From "classloader" <classloa...@hotmail.com>
Subject Re: SVG->PNG, background tranparency problem. Help please
Date Tue, 05 Mar 2002 19:17:59 GMT
I got so much valuable information from you guys.
Thanks a lot, everybody!
Leo


----- Original Message -----
From: "Chris Lilley" <chris@w3.org>
To: "classloader" <classloader@hotmail.com>
Cc: <batik-users@xml.apache.org>
Sent: Tuesday, March 05, 2002 10:55 AM
Subject: Re: SVG->PNG, background tranparency problem. Help please


> On Sunday, March 03, 2002, 8:45:07 PM, classloader wrote:
>
>
> c> But after I create the webpage with that svg5.PNG file, I put it on top
of my testing webpage, and browse it with IE 6. I found its background is
not transparent at all.
> c> [http://www.dynazone.com/SVG/movingNotTransparent.htm]
>
> c> I tried different approaches, but all failed:
> c> 1) java -jar batik-resterizer.jar -bg 0.0.0.0 svg5.svg  --- failed
> c> 2) Change the PNGTranscoder.java, change variable "a" to 0. a is alpha
channel value. --- failed again
> c> ... ...
> c> Now matter what I have tried, the background of the generated PNG file
was either all black or all white, but never transparent.(I am new to Image
processing, maybe something above I did is not in
> c> correct way. Correct me please. )
>
> To find out whether you have made a good PNG or not, IE is not the
> appropriate tool.
>
> Check out pngcheck which will tell you exactly what chunks are in the
> PNG file, and pngcrush which will let you improve the compression, add
> and delete chunks.   They are both command line tools, compile anywhere.
>
> http://www.libpng.org/pub/png/apps/pngcheck.html
> http://pmt.sourceforge.net/pngcrush/
>
> --
>  Chris                            mailto:chris@w3.org
>
>
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