The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 149

Figure 2.76
Note
The resolution of the image you are using will determine the amount of noise you
add. High-resolution images are good at 400%, whereas lower-resolution images
(e.g., 120ppi) would be best around 200%.
4. With the selection visible, go to Filter > Blur > Radial Blur. Set Amount to 30,
choose Blur Method: Zoom and Quality: Best ( Figure 2.77 ) , and click OK.