[Mapserver-users] Image (PNG) not transparent in Netscape 6

[Ed McNierney]

Gerry -

We're serving nothing but PNG maps on TopoZone right now, and have had no particular PNG issues with IE.  The only IE issue I'm aware of is that IE 5.01 on Windows does not print 8-bit PNG images correctly - the palette gets garbled.  But that was fixed by Microsoft in an IE release about four years ago, and there aren't many users left on IE 5.01.

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 

-----Original Message-----
From: Gerry Creager N5JXS [mailto:gerry.creager at tamu.edu]
Sent: Thursday, September 18, 2003 9:29 AM
To: Bjoern Platzen
Cc: Steve Lime; mapserver-users at lists.gis.umn.edu
Subject: Re: [Mapserver-users] Image (PNG) not transparent in Netscape 6


Now that you mention it, I've been working with png's created by 
ImageMagick, from GemPak-created gif's.  The PNG's have artifacts that 
don't appear in the GIF's, as viewed on Mozilla 1.4a.  Apparently, in my 
case, ImageMagick's translation algorithm is taking some liberties with 
a couple of low-order bits.

Overall, I've had excellent luck with png in netscape/mozilla, and 
dismal success in Ieeeeeeeeee.  However, I've abandoned png for my radar 
mosaics because of this anomaly.

Summary:  I'm no longer sure whether I blame Netscape or ImageMagick.

gerry

Bjoern Platzen wrote:
> Hi Steve,
> 
> I already did such a test with a Fireworks-generated PNG and it works in 
> NS 6. But I think that mustn't mean, that it's not a NS-Bug...
> 
> The WMS-Client that does the GetMap-Request requests as well Maps from 
> other WMS (that are not UMN-MapServer-WMS) and there the transparency 
> works. AFAIK these WMS use Index-Transparency.
> 
> Does MapServer 3.6 support Index-Transparency? I couldn't find in the 
> docs, so I think it does not, right?
> 
> At the Moment the WMS-Client is presented at the InterGeo in Hamburg, so 
> that we are going to dig deeper into this next week. I just hoped, that 
> this would be a known issue... (though I didn't find anything about 
> this in the archives)
> 
> I you or someone else has another idea, what may cause the problem, 
> please tell me...
> 
> Thanks,
> 
> Bjoern.
> 
> 
> Am Donnerstag, 18. September 2003 01:24 schrieb Steve Lime:
> 
>>Blame Netscape would be my guess. To test? Create a supposedly
>>transparent PNG outside of MapServer and see what happens.
>>
>>Steve
>>
> 
> 

-- 
Gerry Creager -- gerry.creager at tamu.edu
Texas Mesonet -- AATLT, Texas A&M University	
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.847.8578
Page: 979.228.0173
Office: 903A Eller Bldg, TAMU, College Station, TX 77843

_______________________________________________
Mapserver-users mailing list
Mapserver-users at lists.gis.umn.edu
http://lists.gis.umn.edu/mailman/listinfo/mapserver-users