[Mapserver-users] PNG Transparency in Internet Explorer - Solution

Thu Dec 18 15:59:54 EST 2003

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Hi List,

Thought this might prove useful to someone...

Problem:

Internet Explorer does not correctly render transparency in PNG images.

Solution:

> This needs to go in the <head> of the HTML file that will display a PNG:
> 
> <style type="text/css">
> img { behavior:	url("pngbehavior.htc"); }
> </style>
> 
> Alternatively, the following line may be included in a CSS (Stylesheet)
> that is used by the page:
> img { behavior:	url("pngbehavior.htc"); }
> 
> It is only required by Internet Explorer, but will not cause problems in
> other browsers.
> 
> Also, the attached pngbehaviour.htc file must be present in the directory
> of the HTML files displaying PNG images and the spacer.gif must be
> accessible to the pngbehaviour.htc script (default is images/spacer.gif).
> 
> 
>  <<pngbehavior.zip>>  <<spacer.zip>> 
> 
We came across this issue when using Mapserver as our WMS for the USGS
National Map. Our layers obscured everything below them in Internet
Explorer, but were correctly transparent in Mozilla. When USGS implements
this things should be OK in Internet Explorer also.

> David Lowther
> Software Engineer
> GEO Information Systems
> University of Oklahoma
> dlowther at ou.edu
> (405) 325-3131
> http://www.geo.ou.edu <http://www.geo.ou.edu> 
> 
> 
> 

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<HEAD>
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<META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
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<TITLE>PNG Transparency in Internet Explorer - Solution</TITLE>
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<BODY>

<P><FONT SIZE=3D2 FACE=3D"Arial">Hi List,</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Thought this might prove useful to =
someone...</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Problem:</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Internet Explorer does not correctly =
render transparency in PNG images.</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Solution:</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">This needs to go in the &lt;head&gt; =
of the HTML file that will display a PNG:</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">&lt;style =
type=3D&quot;text/css&quot;&gt;</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">img { behavior: =
url(&quot;pngbehavior.htc&quot;); }</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">&lt;/style&gt;</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Alternatively, the following line may =
be included in a CSS (Stylesheet) that is used by the page:</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">img { behavior: =
url(&quot;pngbehavior.htc&quot;); }</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">It is only required by Internet =
Explorer, but will not cause problems in other browsers.</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Also, the attached pngbehaviour.htc =
file must be present in the directory of the HTML files displaying PNG =
images and the spacer.gif must be accessible to the pngbehaviour.htc =
script (default is images/spacer.gif).</FONT></P>
<BR>

<P><FONT FACE=3D"Arial" SIZE=3D2 COLOR=3D"#000000"> =
&lt;&lt;pngbehavior.zip&gt;&gt; </FONT><FONT FACE=3D"Arial" SIZE=3D2 =
COLOR=3D"#000000"> &lt;&lt;spacer.zip&gt;&gt; </FONT>
</P>

We came across this issue when using =
Mapserver as our WMS for the USGS National Map. Our layers obscured =
everything below them in Internet Explorer, but were correctly =
transparent in Mozilla. When USGS implements this things should be OK =
in Internet Explorer also.

<P><FONT SIZE=3D2 FACE=3D"Arial">David Lowther</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">Software Engineer</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">GEO Information Systems</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">University of Oklahoma</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">dlowther at ou.edu</FONT>
<BR><FONT SIZE=3D2 FACE=3D"Arial">(405) 325-3131</FONT>
<BR><A HREF=3D"http://www.geo.ou.edu"><U><FONT COLOR=3D"#0000FF" =
SIZE=3D2 FACE=3D"Arial">http://www.geo.ou.edu</FONT></U></A>
</P>
<BR>
<BR>

</BODY>
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