come up with a default raster symbolizer that plays nice with floating point 
rasters
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                 Key: GEOS-3255
                 URL: http://jira.codehaus.org/browse/GEOS-3255
             Project: GeoServer
          Issue Type: Task
            Reporter: Gabriel Roldán
            Assignee: Gabriel Roldán
         Attachments: floatraster.tiff, floatraster_capture.png

floatraster.tiff is a geotiff image with float samples.
floatraster_capture.png is how it looks if I open it with Mac OS's Preview app

If floatraster.tiff is configured in geoserver with the default raster 
symbolizer, the result is black (there might be non completely black pixels, 
but it looks like it)

Enabling the gc renderer debugging option writes presample.tiff and 
preSymbolizer.tiff alright (like floatraster_capture.png) and final.tiff as 
black, which is how I figured out it's a symbolizer issue. Using a color ramp 
symbolizer works ok, just thought it'd be nice for the default raster SLD to 
show something

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