Dissolves are commonly used in video, but you can create them in PowerPoint, too, using the Fade animation. Some people use the Dissolve slide transition, but the results don’t look very good and you can’t control the timing. Here’s a sample slide:
This technique shows how to dissolve the first image into a second one that shows a presenter interacting more with the audience
First insert the second image by choosing Insert> Pictures> From File. (In PowerPoint 2007, choose Insert tab> Illustrations group> Picture.) Then insert the first image on top of the second. Move the first image slightly, so you can easily select the second image on the bottom.
Choose Slide Show> Custom Animation. (In PowerPoint 2007, go to Animations tab> Custom Animation.) Select the first image, and choose Add Effect> Exit> Fade. Set the Start to After Previous. Set the Speed to Medium, or whatever speed gives you the result you like. To specify how long the image will be on the screen before it starts to face, select its item in the Custom Animation task pane, click the down arrow on the right, and choose Timing. Then add a value in the Delay text box, such as 1 second.
Select the second image and choose Add Effect> Entrance> Face. Set the Start to With Previous and the Speed to Medium.
Finally, place the first image exactly on top of the second image.
The result is an animation that shows the first image, then fades it out while the second image fades in. Note that if the two images are exactly the same size, you don’t need to add entrance animation to the second image; you can simply fade out the first image to reveal the second image.
Watch the video (the effect is smoother in PowerPoint)
Don’t the interacting people looking like they’re having more fun?