Grafixman is on the right track...

Go to Edit/Fadeout.At the bottom of the pop-up box, click in the box that says Multicolor. This will bring up the Palette Ramp editor. Choose the first box, 01, click OK. This brings back the pop-up menu. At the top Fill Menu, click on the left-to-right arrow, then OK. R/C on your image, convert to object, then drag to a new window. You should now have an image fading to the right.

Hope this is what you were looking for....