[Mack]

How To Tip:

Create a Web animation using a layered Photoshop image.

An animation is made up of a sequence of frames. By varying each frame slightly from the next, you achieve an illusion of motion. You can create simple animations in Adobe ImageReady using a layered Photoshop or ImageReady image. The image contains all the elements of the animation on separate layers. Rather than duplicate and vary the entire image over and over, you vary the content of each frame by hiding or showing layers for each frame. You need only one copy of each layer containing static elements, whereas an element in motion will probably require several layers to create an impression of smooth, fluid movement.
# In Photoshop, create an image you want to animate. Include a single layer for each static element. Create multiple layers for moving elements. Each layer for a moving element should represent its position at a different point in time.
# Save the file, and choose File > Edit in ImageReady. The ImageReady application opens and displays the image.
# Click the Animation tab to bring the Animation palette to the front or, if the palette isn't open, choose Window > Animation. ImageReady creates the first frame of the animation.

Directly from the Help File