PowerPoint 2007: How To Add or Remove Alternate Text Associated with an Image
Contributed by Rob Rogers 
Tagged: Microsoft Powerpoint In PowerPoint 2003, this option was located under Format Picture however the latest version has moved things around. To access the alternate text . . .
1. Right-click on the image.
2. Select Size and Position.
3. Select the Alt Text tab.
4. Make your changes to the Alternative text.
5. Click the Close button.
NOTE: In Word 2007 this option is under Size and in Excel 2007 you will find it under Size and Properties.
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Lauren said on April 12, 2011
for documents with over a thousand images is there any other way to get rid of the alternative text for everythignin the power point?
Liono said on December 12, 2011
I follow those steps, put all the information and it is Not working. Can anyone help me?.
I’m using Powerpoint 2010.