When you hover your mouse over an image in Excel, you may notice that a small pop-up window appears with some text. This text is called a ScreenTip, and it can be customized to provide more information about the image.
To customize a ScreenTip for an image in Excel:
Right-click on the image and select Edit Alt Text from the menu that appears.
In the Description field, enter the text that you want to appear in the ScreenTip.
Click OK. The next time you hover your mouse over the image, the new ScreenTip will appear.
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