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I'm using ArcGIS Desktop 10.0.

I need to set my background rgb value of 255,255,255 to transparent. In the layer-Properties Windows > Symbology I can do it for one layer, but can I batch set this, or use arcpy? I have to do it for around 300 layers.

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It seems that I can do it for an mxd document by going to :

Tools > ArcMAP-Options > Raster > RasterLayer > Background value

All Raster layers that are then subsequently added will receive the defined background color.

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I'm not aware of any way that you can do this for existing layers in batch or via ArcPy.

However, there is an ArcGIS Idea called ArcPy.Mapping - Support Layer Symbology Property Modifications that looks like it would meet your requirement so I recommend that you vote for that.

Develop arcpy.mapping to support layer symbology modifications.

Examples include:

1. Changing ... colour (rgb and cmyk input values), size, font properies of single symbol
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