Figured it out. Type=UInt16 was the culprit on the source .png's.
> -----Original Message----- > From: [EMAIL PROTECTED] [mailto:mapserver-users- > [EMAIL PROTECTED] On Behalf Of Charlton Galvarino > Sent: Sunday, October 19, 2008 2:15 PM > To: Mapserver Users ([email protected]) > Subject: [mapserver-users] strange png alpha behavior > > Hi, all. I'm stumped, and I've tried everything I can think of. > Rebuilding gdal, rebuilding libpng, rebuilding mapserver. Even the > version of mapserver doesn't really matter to me, but I have tried the > latest and greatest. > > MapServer version 5.2.0 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP > OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=FREETYPE SUPPORTS=ICONV > SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER > SUPPORTS=WFS_CLIENT SUPPORTS=GEOS INPUT=EPPL7 INPUT=POSTGIS INPUT=OGR > INPUT=GDAL INPUT=SHAPEFILE > > If I pass b.png thru a normal WMS request, it looks beautimous. If I pass > a, it is incorrect. a.png and b.png were made on different boxes against > the same source data, and in spite of my best efforts to make those boxes' > builds identical wrt gdal, ogr, etc. something is still different. > > for b . . . > > Driver: PNG/Portable Network Graphics > Files: /home/charlton/Temp/b.png > Size is 640, 720 > Coordinate System is `' > Origin = (-100.003428819444423,49.999956597222223) > Pixel Size = (0.062413194444444,-0.062413194444444) > Image Structure Metadata: > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left (-100.0034288, 49.9999566) > Lower Left (-100.0034288, 5.0624566) > Upper Right ( -60.0589844, 49.9999566) > Lower Right ( -60.0589844, 5.0624566) > Center ( -80.0312066, 27.5312066) > Band 1 Block=640x1 Type=Byte, ColorInterp=Red > Mask Flags: PER_DATASET ALPHA > Band 2 Block=640x1 Type=Byte, ColorInterp=Green > Mask Flags: PER_DATASET ALPHA > Band 3 Block=640x1 Type=Byte, ColorInterp=Blue > Mask Flags: PER_DATASET ALPHA > Band 4 Block=640x1 Type=Byte, ColorInterp=Alpha > > for a . . . > > Driver: PNG/Portable Network Graphics > Files: /home/charlton/Temp/a.png > Size is 640, 720 > Coordinate System is `' > Origin = (-100.003428819444423,49.999956597222223) > Pixel Size = (0.062413194444444,-0.062413194444444) > Image Structure Metadata: > INTERLEAVE=PIXEL > Corner Coordinates: > Upper Left (-100.0034288, 49.9999566) > Lower Left (-100.0034288, 5.0624566) > Upper Right ( -60.0589844, 49.9999566) > Lower Right ( -60.0589844, 5.0624566) > Center ( -80.0312066, 27.5312066) > Band 1 Block=640x1 Type=UInt16, ColorInterp=Red Band 2 Block=640x1 > Type=UInt16, ColorInterp=Green Band 3 Block=640x1 Type=UInt16, > ColorInterp=Blue Band 4 Block=640x1 Type=UInt16, ColorInterp=Alpha > > I don't know enough about PNG to know what PER_DATASET ALPHA is. But is > this what might be upsetting the final product? > > Plugging a or b into udig directly looks fine, and the a,b images look > great. But you can see that after I pass it thru a WMS request, I get > bad_output.png. > > Any ideas? > > TIA, > > Charlton > > > > > > Charlton Galvarino > 1 (803) 233-6205 : voice > 1 (803) 223-9579 : fax > [EMAIL PROTECTED] > > P.O. Box 50960 > Columbia, SC 29250 _______________________________________________ mapserver-users mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/mapserver-users
