[mapserver-users] Trouble coloring a raster

[Brent Fraser]

Bob,

   As Jeff indicates, you need an EXPRESSION in your CLASS, something like:

EXPRESSION ([pixel] > 100)

The EXPRESSION has a look at each of the image's pixel values (and 
that's why it's slow)

Best Regards,
Brent Fraser

On 3/5/2013 1:18 PM, Bistrais, Bob wrote:
>
> Yes, I had looked at that webpage and thought I was doing it 
> correctly.  My TIFF is a single band, 8-bit, with no colormap.  Still 
> don't see why it won't display in color.
>
> *From:*Brent Fraser [mailto:bfraser at geoanalytic.com]
> *Sent:* Tuesday, March 05, 2013 3:13 PM
> *To:* Bistrais, Bob
> *Cc:* mapserver-users at lists.osgeo.org
> *Subject:* Re: [mapserver-users] Trouble coloring a raster
>
> Bob,
>     I'd recommend just re-rendering the raster off-line for 
> performance reasons, but if data management makes that difficult have 
> a look at the  "Classifying Rasters" section of 
> http://www.mapserver.org/input/raster.html#how-are-rasters-added-to-a-map-file. 
> And Mapserver can only classify a single 8-bit  band (grey or 
> paletted), even if your image is say 3 band RGB.
>
> Best Regards,
> Brent Fraser
>
> On 3/5/2013 12:53 PM, Bistrais, Bob wrote:
>
>     I have a geotiff raster which represents forested lands.  I'd like
>     it to display in green.  I put in a Style section and specified a
>     color, but try as I might, it always displays in grayscale.  It is
>     an 8-bit unsigned TIFF file.
>
>     Below is the layer specification:
>
>     LAYER
>
>       NAME "ForestLands"
>
>       GROUP "ForestLands"
>
>       TYPE RASTER
>
>       STATUS on
>
>       DATA "/mapserver_data/StreamBarriers/forestland06.tif"
>
>       METADATA
>
>         "wms_srs" "EPSG:4326 EPSG:26919 EPSG:26983 EPSG:26984 EPSG:102113"
>
>     "wms_name"                                "ForestLands"
>
>         "wms_server_version" "1.1.1"
>
>         "wms_format"              "image/png"
>
>       END
>
>       CLASS
>
>         NAME "Forest"
>
>         STYLE
>
>             COLOR 0 250 0
>
>         END
>
>       END
>
>     END
>
>
>
>
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