If you import a TARGA (.tga) file that contains transparency (alpha
channel) information into PowerPoint 97, it appears opaque. In contrast,
if you import a CompuServe GIF (.gif) or Portable Network Graphics (.png)
file that contains transparency information, it appears transparent.
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The TARGA import filter that ships with PowerPoint 97 and Office 97 does
not support transparency. The GIF and PNG import filters do support
transparency.
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You can use the Set Transparent Color button on the Picture toolbar or
Microsoft Photo Editor to make any image transparent. For more
information on doing this, please see the following article in the
Microsoft Knowledge Base:
159014 (http://support.microsoft.com/kb/159014/EN-US/) PPT: Transparent Image Support in PowerPoint 97 and 98
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