Things You'll Need:
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Step 1
With your digital photo opened in Photoshop, use the lasso or other selection tools to select your object. Cut and paste the object into a new layer--we'll call this object 1.
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Step 2
Duplicate object 1, by going to Layer/Duplicate layer. We'll call this object 2.
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Step 3
Click on object 1. Go to Edit/Transform, Flip vertical. Use your move tool (black arrow) to position the upside-down object for the correct position for the shadow.
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Step 4
Now go to Edit/Transform/Distort. Distort the object to a realistic perspective.
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Step 5
Add color by clicking the Layer Effects button at the bottom of the layers palette. Choose Color Overlay. Click in the rectangle to pick a medium gray color.
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Step 6
Duplicate that layer by going to Layer/Duplicate Layer. Highlight this layer and its copy with your cursor, holding down the shift key. Press control-E to merge the two layers.
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Step 7
Turn your blending mode (at the top of the layers palette) from Normal to Multiply.
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Step 8
Blur your shadow by going to Filter/Blur/Gaussian blur. Congratulations--you've made a cast shadow.






