BUG
Note:Maps exported from ArcMap to either the PNG or GIF format do not have a transparent background even if the background was set to no data. The background displays either as white or the same color as the Windows background.
This issue is addressed with ArcGIS 9.1 Service Pack 2 (SP2).
Note:
This issue is addressed with ArcGIS 9.1 Service Pack 2 (SP2).
Note:
If the problem continues after installing 9.1 SP2, ensure that the Background Color and Transparent Color are set correctly, as described in steps 7 and 8 below.
Note:
It is a known limitation of the ArcGIS 9.1 Service Pack 1 that screen font smoothing is not supported for exporting from ArcMap to PNG or GIF with transparent backgrounds. This has been fixed in ArcGIS 9.1 Service Pack 2.
Note:
Transparency is not supported with 24-bit True-color PNG or GIF exports at ArcGIS 9.1 Service Pack 1. This has been fixed in ArcGIS 9.1 Service Pack 2.
Article ID:000007730
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