Creating the Alpha Channels

We're going to use alpha channel selections to perform the magic. As you follow these steps, keep in mind that, unless you change the values using a control I describe next, the darker the pixels in the alpha channel/selection, the blurrier the corresponding pixels will be after the filter is applied. Let's get started. First, let's define the area to be blurred using two separate alpha channels, one for the far background we want heavily blurred, and one for the near background and foreground we want partially blurred.

1. Press Q to enter Quick Mask mode.

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