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STEP 1 :
Open an image and create a new layer and place the new layer over the image layer in the layer palette .
choose paint bucket tool and fill the new layer with black.
choose filter>> noise >> add noise and adjust settings as follow.
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create anew layer and place it over the other layers in the layer palette and fill it with black as we do before in the other layer.
Also Apply the add noise filter but increase the amount to "61" instead of "60" and then apply the motion blur filter with the same previous settings.
try this step 2 times but when u apply the noise filter you must increase "1" to the amount (i.e. the 3rd layer "62" and the 4th "63".
Now change the mode of all 4 layers to screen and then change the fill of all layers to 60.
you should see you project like this image:
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select file >> Edit in ImageReady .
in the imageready show the animation palette and layers palette if they are invisible:
To do that :
choose Window >> Timeline
Window >> Layers.
in the animation window at the first frame go to the layer palette and make all layers invisible except the basic image layer and one layer.
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Repeat this process until you have 4 frames each one contains the basic image layer with only one rain layer.
After that set the time of the frames to 0.1 second
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from : kaskus.com