Summary
It is possible to add an image or watermark to every slide in a PowerPoint presentation, either by applying it to all slides or applying it to certain slide layouts. This can be done by using clip art or pictures, or by using a picture and setting the transparency to the right.
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To add a logo or other picture to all slides, it needs to be added to the Slide Master.
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The Slide Master can be thought of as the backbone of the presentation.
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Summary
Microsoft PowerPoint allows users to add an image or a transparent watermark to every slide in their presentation, either by applying it to all slides or applying it to certain slide layouts. This can be done by using clip art or pictures, or by using a picture and setting the transparency to the right. If the image does not appear on one of the slides, the Hide Background Graphics check box must be checked.
Add the same image or watermark to every slide - Microsoft Support
microsoft.com
Learn different ways to insert pictures in PowerPoint. Find the pros and cons of using ... An easy way to insert pictures to your slides is to use the default ...
Ways to insert pictures in PowerPoint
presentation-process.com