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Problem: Transparency in ArcMap is not working.

Description

Note:
This article pertains to ArcGIS versions 8.x. Later versions of ArcGIS may contain different functionality, as well as different names and locations for menus, commands and geoprocessing tools.

Transparency is not applied to a raster or polygon layer when typing a value for %Transparent in the Properties/Display tab. The Adjust Transparency button on the Effects toolbar is also grayed out.

Cause

Your system's display properties are not set to true color. Transparency only works in true color mode.

Solution or Workaround

Set your system's Color Palette to True Color:

  1. Click Start > Settings > Control Panel.
  2. Double-click the Display icon
  3. Click the Settings tab
  4. Select True Color from the Color Palette drop-down list.
  5. Click OK.