[MS4W-Users] WMS imagery has transparent pixels
Gerben.Tiemens at grontmij.nl
Fri Jan 22 05:05:26 EST 2010
Did you solve the problem already? When I access your WMS, it has no transparency anymore, with using png.
Even with parameter for wms Transparent=true it does not show transparent pixels..
For testing I used this HTML, so you can easily see it works, because I specified black background, transparent would be black, this is not the case with these clouds:
<div style="width:1015px;height:795px;background-color:black;" id="map"><img src= "http://mapservertest.maine.gov/wms/mapserv.exe?map=c:/wms/orthos.map&SERVICE=WMS&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&BBOX=-68.916164,45.940735,-68.866133,45.979912&SRS=EPSG:4326&WIDTH=1015&HEIGHT=795&LAYERS=Baxter_04%2CBaxter_04_5m%2CBaxter_04_25m&STYLES=%2C%2C&FORMAT=image/png&DPI=96&TRANSPARENT=TRUE"/></div>
Van: ms4w-users-bounces at lists.maptools.org [mailto:ms4w-users-bounces at lists.maptools.org] Namens Smith, Michael
Verzonden: Thursday, January 21, 2010 8:43 PM
Aan: ms4w-users at lists.maptools.org
Onderwerp: Re: [MS4W-Users] WMS imagery has transparent pixels
But what I am trying to achieve is to have the 255 255 255 pixels NOT transparent, they are already transparent and I need the opposite (they are clouds in aerial photos and where they are totally white, there are holes right through to whatever's underneath).
Also according to the MS documentation, TRANSPARENT will not work with RGB (would need to use RGBA). I did try that, with TRANSPARENT=OFF and IMAGEMODE=RGBA, no change in behavior.
Regarding JPEG, we found initially that certain clients would not accept JPEGs from WMS, and that is why we use PNG. It seems the most widely supported.
State GIS Manager
Maine Office of GIS
State House Station 174
264 Civic Center Drive
Augusta ME 04333-0174
From: karsten vennemann [mailto:karsten at terragis.net]
Sent: Thursday, January 21, 2010 12:28 PM
To: ms4w-users at lists.maptools.org
Cc: Smith, Michael
Subject: RE: [MS4W-Users] WMS imagery has transparent pixels
Try setting FORMATOPTION "TRANSPARENT=ON" in your outputformat declaration and choose an image type that supports transparency like png.
Note: I had usually the opposite problem with vector layers and WMS when I set color to 255 255 255 that as WMS renders then transparent. In that acse with vectors and one can set color 254 254 254 instead and it will render fine (white).
Terra GIS LTD
Seattle, WA, USA
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