Hi, I want to turn all non-transparent 'near white' pixels transparent. I've tried:
LAYER NAME "xx" TYPE RASTER CONNECTIONTYPE ogr CONNECTION "file.wld" DATA "file.gif" # copied from here: http://mapserver.org/input/raster.html#raster # but I added the [alpha] and opacity part CLASS NAME "near white" EXPRESSION ( ([red] > 225) AND ([green] > 225) AND ([blue] > 225) AND ([alpha] > 225) ) STYLE OPACITY 0 END END END (The file is an RGBA gif file.) The [alpha] expression isn't recognized. In fact, [foo] works just the same. gdalinfo of the file shows: Color Table (RGB with 32 entries) 0: 255,255,255,0 1: 240,240,240,255 ... So it seems that the 0 entry defines the transparent color. Q: is [alpha] a valid EXPRESSION item? Is something else wrong? Thanks, Wendell p.s., I'm always amazed at how capable and terrific mapserver is when you dig enough into it. p.p.s: MapServer version 5.4.1 _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users