You have an image with a complicated background (not a solid color), and you need to remove the background to be able to use it in the presentation.
Backup
To remove a background from an image, simply:
Select the image on your slide
Navigate to the Picture Tools Format tab
Select the Remove Background command
Adjust your removal settings (described below)
Select Keep Changes
When you first select the Remove Background command, PowerPoint takes a guess at what you want to remove. While PowerPoint normally does a pretty good job at guessing, it doesn’t always get it right.
When this happens to you, all you need to do is adjust the background removal options to specify what you want to keep and remove in your picture. If PowerPoint doesn’t guess correctly, you can simply mark the areas you want to keep. To do that, simply:
Select Mark Areas to Keep
Click and draw over the parts of your photo you want to keep (a green marker)
Click Keep Changes
Selecting keep changes, PowerPoint readjusts what parts of your image background are removed. You might need to mark areas to keep a few times before you finally get it right
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