On Tue, Apr 26, 2011 at 11:46 AM, Mark Korver <[email protected]> wrote:
> Maybe you can just define the layer 2X in the mapfile. Put the > altered layer on top of the regular layer? I am assuming that you can > get the good values to be transparent and not white. > Thanks Mark! This works great. > On Tue, Apr 26, 2011 at 11:57 AM, Matt Bartolome <[email protected]> > wrote: > > Hello, > > I have a funky raster I'm trying to tile as jpegs. For whatever reason > this > > RGB raster has white pixels on the source raster which should be black. > Is > > it possible to set only these white pixels to be black on the output > jpeg? I > > was playing around with the CLASS directive. This sets all those white > > pixels to black, but it does not preserve the rest of the rgb that I want > to > > use; those "good" values are not processed and show as blank (white) > space. > > How do I do this? I thought of preprocessing this with gdalwarp but the > > raster becomes too large (source is an ecw) on output so need to do it > > on-the-fly with mapserver (I'm using mapserver trunk and gdal 1.8 on > linux). > > > > Thanks! > > Matt > > > > OUTPUTFORMAT > > NAME jpeg > > DRIVER "AGG/JPEG" > > MIMETYPE "image/jpeg" > > IMAGEMODE RGB > > EXTENSION "jpg" > > END > > > > LAYER > > NAME "test" > > TYPE RASTER > > STATUS ON > > DATA "/test.tif" > > > > PROJECTION > > "init=epsg:2230" > > END > > > > PROCESSING "NODATA=255" > > > > CLASS > > NAME "set white to black" > > EXPRESSION ([red] = 255 AND [green] = 255 AND [blue] = 255) > > STYLE > > COLOR 0 0 0 > > END > > > > END > > > > _______________________________________________ > > mapserver-users mailing list > > [email protected] > > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > > > >
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