You can create a transparent area in most pictures except in animated GIF (animated GIF: A file that contains a series of Graphics Interchange Format (GIF) images that are displayed in rapid sequence by some Web browsers to produce an animated effect.) pictures. Make these changes in an animated GIF editing program, and then insert the file again.
Note If the Picture toolbar is not visible, click Toolbars on the View menu, and then click Picture.
Note The Set Transparent Color option is available for bitmap (bitmap: A picture made from a series of small dots, much like a piece of graph paper with certain squares filled in to form shapes and lines. When stored as files, bitmaps usually have the extension .bmp.) pictures that don't already have transparency information. It's also available for some, but not all, clip art (clip art: A single piece of ready-made art, often appearing as a bitmap or a combination of drawn shapes.).