I want to blur everything else that is not currently selected. In order to do this, I have to invert the selection, selecting everything that is not currently selected and deselecting what is currently selected. I can do this by going to the "Select" menu and sliding down and selecting "Inverse".
Now that I have the background selected, I want to blur it. I can do this by going to the "Filter" menu, sliding down to "Blur" and sliding over and down to "Gaussian Blur".
I will move the slider for "Radius" back and forth until I get a blurring effect that I'm satisfied with. 58.6 pixels is what I'm going to choose. I'll click the "OK" button to apply the blur.
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