How to blur only the edges of an image or photo

People often ask how to blur only the edges of an image, as shown below:

Of course you may want to have more or less blur over more or less area of the photo. These settings are simply adjusted using two slider controls. Anyway, the first step is to open the image file and select the Blur effect when presented with the list of effects available. Next click on "Fine Tune..." and you will get a dialog like this:

As you can see it is very easy to change the settings. For example the image below shows an "elliptical vignette" using the blur filter:

Of course you can experiment with the settings, maybe trying Circular Vignette, or changing the mix percentage, or the sharpness of the change from unblurred image to blurred image.

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