Radial Blur.

This is the image that I will be adding the radial blur to as it has detail throughout the whole image.

First we select the circular marquee tool and draw a circle in to the center of the image.

We then have to feather the circle by going on 'Select', 'Modify' and then 'Feather' so as the outcome doesn't look too cut-and-paste and blends in to the image.

We then choose to Invert the selected area so as the circle is the only area that isn't selected and the blur will only affect the surrounding area.

The dotted line around the whole image shows that the selection has been inverted.

To apply the blur to the picture, we choose 'Filter', 'Blur' and then 'Radial Blur'.

This box then allows us to change the settings for the blur and I have set it to Zoom blur at a size of 82 for my image.

This is the effect of the blur and you can see that it has feathered and faded from the blur in to the sharp original part of the image.

This is the final image when the radial blur areas have been deselected.

I like this effect on photoshop as it draws attention to the center of the image and could also be used for other types of images such as macro and would give it a unique effect. I would use it on a few of my images but I think that too many pictures with this effect wouldn't show off important portfolio images very well so I would use it to boost the effect of some weaker images to make them more presentable.