Five Ways to Adjust Clarity in Photoshop Elements 11
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Blur when you need to.
It may sound strange that anyone would intentionally want to blur an image. But, if your photo is overly grainy or suffers from an ugly moiré pattern, you may need to blur the image to correct the problem. Also, often, you may even want to blur the background of an image to de-emphasize distractions or to make the foreground elements appear sharper and provide a better focal point.
You can access all the blurring tools by choosing Filter→Blur in Expert or Quick mode.