In this tutorial, we will learn how to export a PNG graphic from
Microsoft Expression with an alpha channel that PowerPoint can
import. I have used the new Microsoft Expression 3.3 for Macintosh.
The PowerPoint version used is PowerPoint X for Macintosh. The
same techniques should work with the Windows version.
Presently, you can download free versions of Expression for the
Mac and Windows from the
Microsoft website...
Launch Expression and choose File | New - Expression will create
a new document.
Open or create a simple drawing that uses a transparent gradient.
For this tutorial, I created three rectangles with a 'red to
transparent' fill. I also applied a repeating Stars stroke to
the rectangles. Save your drawing.
Choose a name and location to save the graphic. Within the
Format drop down box, choose 'PNG'. Click the Save button.
You'll now see the Bitmap Setting dialog box. Check all the
three options listed on the bottom left: Keep Aspect Ratio, Save
Alpha Channel and Anti-Alias. Click OK - in the next dialog box,
clck OK again ito save the drawing as a PNG bitmap (see both
the screenshots). Save your document and exit Expression.
In PowerPoint, create a new presentation or open an existing
one. On a blank slide, just insert the exported PNG using the
Insert | Picture command - the screenshot below shows you how
the transparent areas reveal themselves.
