Article ID: 285519 - View products that this article applies to.
This article was previously published under Q285519
When you insert a picture into a Microsoft PowerPoint presentation, and you use the Set Transparent Color tool to make the background of the picture transparent, a thin, ragged border may appear around the foreground image in your picture, as if the color of the foreground image is bleeding into the background slightly.
This behavior occurs because the edge of the foreground image contains pixels that are not quite the same color as the image's background color (now transparent) and the non-transparent color portion of the graphic; this slight color variation is the result of an anti-aliasing or smoothing process.
Because the Set Transparent Color tool can treat only one color as transparent, these edge (or border) pixels, which appear to be the same color as the background, are not set to transparent.
This behavior can also occur if the background color is not really one color, but a mixture of two or more colors.
To work around this issue, use a graphic program like Microsoft PhotoDraw to save the image in a format that is specifically for use in a Microsoft PowerPoint presentation. PhotoDraw uses the Portable Network Graphics (PNG) format, but other such programs may have different options to permit you to set the transparency properties when you create or edit the image.
However, if you are using a Windows Bitmap image, you must set the transparency of the background manually before you save the image in a format suitable for use in a PowerPoint presentation.
If you are using other image editing software, please consult that product's manual and help files for directions about how to make a color transparent.
To use PhotoDraw to save an image for use in a PowerPoint presentation, follow these steps:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.