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Open an exsisting picture that has an aliasing problem, like this one. Notice the jagged edges. The trick here is to get rid of the jagged edges or anti-alias them.
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First, click on the "Magic Wand". There are really more ways to do this, but for now set both the "Tolerence" and "Feather" for the "Magic Wand" to zero. One by one, while holding down the shift button on your keyboard, click on each part until they are all selected.
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With the parts still selected, from the top line menu click "Selections" then "Modify" then "Feather". Set "Feather" to 1 or 2, maybe more depending on how bad it is. Click "OK". You won't see much change, but notice the dashed lines are a little away from the selected parts.
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Change the background color to the color of the parts. Press "Delete" on your keyboard 4 or 5 times, again this depends on how bad it is.
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