[OpenLayers-Users] Way to mask raster WMS layers

[Phil Scadden]

>
> I was wondering if there is a way to mask raster layers that are 
> loaded via WMS (OpenLayers.Layer.WMS). What I am thinking of is a case 
> where for all pixels that are withing a certain range make them 
> transparent. 
I have never done this but it should be straightfoward. You want to take 
the SLD being used and add a colourmapentry with opacity="0" for the 
range you want.
For your layer do:
layer.mergeNewParams({sld_body:mySLD}); //mySLD contains the new raster 
style
and redraw.



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