In ArcView 3.x, there was a transparent symbol in the Symbol Palette. In ArcGIS 9.x, a user needs to load a special toolbar to symbolize features as transparent. In addition, a user can change the brightness of an image using this same toolbar.

 

arcgis_transparency

Go to View > Toolbars > Efects to load the Effects Toolbar

* Choose Lakes under Layer

* Click the Transparency button and move the slider bar to 50% You will see the municipal boundary through the lakes now

* Check on the MrSID in your TOC

* Choose MrSID under Layer in the Effects Toolbar

* Click on the Brightness button and adjust up and down. You will see the image change