Setting Transparency for .gif and .png Images
In some images, you may want to set a color to transparent. For example, if your source document has a white background, images with a white background appear as though they do not have a background. However, if your online content has a different color background, the background of these images appear as white areas. You can enable the transparency option in ePublisher to transform the white background into a transparent one. Only .gif and .png images support transparent colors.
Note: Some browser versions do not support transparent colors, especially in .png images.
To set transparency for .gif and .png images
Open your Stationery design project.
On the View menu, click Style Designer.
On the Project menu, click a target in the Active Target menu option that is an output format that supports this option.
In Graphic Styles, select the graphic style you want to modify.
On the Options tab, set the Transparent option to Enabled.