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Setting a Transparent Color
The Transparent Color feature can be really useful, but not all pictures support it. It's available for bitmap images (including scans), and for some but not all clip art. For example, suppose you have a scanned photo of your CEO and you want to make the background transparent so it looks like his head is sitting right on the slide. This feature could help you out with that.
Why some clip-art images but not others? Well, an image can have only one color set to be transparent, and some clip art already has its background set to be transparent. That's why those clips won't work with the Set Transparent Color feature.
To check it out, first insert the picture on a slide. Then, select the clip. If the Set Transparent Color button is not grayed out on the Picture toolbar, you can set a transparent color by following these steps:
Select the picture.
Click the Set Transparent Color button on the Picture toolbar.
On the picture, click the color that you want to make transparent. If the results are not what you want, click the Undo button or press Ctrl+Z to undo, or repeat step 2 to choose a different color to be transparent.
| Caution | If you set a color to transparent in PowerPoint, every instance of that color in the picture will become transparent. So, if you have a picture of a man with a white shirt on a white background and choose to make white the transparent color (trying to drop out the background), the guy's shirt will become transparent along with the background. Conversely, what looks like one color in a photo is not usually just one color. Think of, for instance, a blue sky. It probably consists of at least two dozen different shades of blue. If you try to make one of those shades of blue transparent using PowerPoint's transparency tool, you'll probably just end up with splotches of transparent areas. So what's the solution? The best way to go is to use alpha channels in a third-party image-editing program to create true transparency and save the image as TIF or PNG. (JPEG format does not support alpha channels.) |
