Transparency can be set for ArcIMS Image Service, ArcIMS ArcMap Service and ArcGIS Map Service layers. The transparency options include:
- Making the entire service layer transparent
This will make all features in all the service sub-layers equally transparent.
- Making the the background of the service layer transparent
This will make the background color of the service layer transparent.
- Making a single color within the layer transparent
This will make the color transparent.
Since these service layers are images, all service sub-layer features underneath the transparent color will also be transparent, regardless of their color.
For ArcIMS service layers Option 1 is done using the Effects tool bar while Option 2 and Option 3 are done in the Advanced Tab of the Layer Properties dialog. For ArcGIS Map service layers all three can be done in the Advanced Tab.