The preeminent Blur filter, Gaussian Blur, blends a specified number of pixels incrementally, following the bell-shaped Gaussian distribution curve I touched on earlier. When you choose Filter ^ Blur ^ Gaussian Blur, Photoshop produces a single Radius option box, in which you can enter any value from 0.1 to 250.0. (Beginning to sound familiar?) As demonstrated in Figure 10-19, Radius values of 1.0 and smaller blur an image slightly; moderate values, between 1.0 and 5.0, turn an image into a rude approximation of life without my glasses on; and higher values blur the image beyond recognition.
Moderate to high Radius values can be especially useful for creating that hugely amusing Star Trek Iridescent Female effect. This is the old Star Trek, of course. Captain Kirk meets some bewitching ambassador or scientist who has just beamed on board. He takes her hand in sincere welcome as he gives out with a lecherous grin and explains how truly honored he is to have such a renowned guest in his transporter room, and so charming to boot. Then we see it — the close-up of the fetching actress shrouded in a kind of gleaming halo that prevents us from discerning if her lips are chapped or perhaps she's hiding an old acne scar, because some cockeyed cinematographer smeared Vaseline all over the camera lens. I mean, what wouldn't you give to be able to recreate this effect in Photoshop?
Unfortunately, I don't have any images of actresses adorned in futuristic go-go boots, so Constantine cum Rambo will have to do in a pinch. The following steps explain how to make the colossal head glow as demonstrated in Figure 10-20.
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