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Problem: Transparent background color in ArcIMS raster symbols are not supported in ArcGIS

Description

If a feature service layer has been authored to draw its features using a transparent background GIF raster symbol, ArcGIS will draw the raster symbol with a gray background.

Cause

ArcGIS does not support transparency for GIF images.

Solution or Workaround

Create a new version of the symbol as a glyph in a TrueType font, or create a new raster symbol that doesn't have a transparent background.