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All right, all right. By popular demand, here is the basis of my starfeild technique.
1. Create the starfield like Greg Martin does. Don't follow his tutorial too rigidly; you want this to be unique. But that will give you the start of your starfield. Don't do all the clone-stamping and erasing yet.
2. Press ctrl-A to select the whole canvas. Copy the contents and paste them onto a new alpha channel. Ctrl-click the channel's thumbnail; you should see marching-ants selections form around the brighter stars. Now go Select>Modify>Expand. Set the value to 1px and hit OK. Press D, then alt-backspace, then ctrl-D. You should see rather large whitish blotches instead of stars. Now go Filter>Blur>Gaussian Blur and set a value of about 3.3px. That value will vary, depending on the look you want.
3. Create a new black layer just above or below the other star layer, and set its blending mode to Linear Dodge or Screen. (Make sure you create a layer, not a channel.) Go back to the Channels palette and ctrl-click your star channel. Go back to the new layer. Press D, then X, then alt-backspace. Your stars should take on a glowy quality.
4. Use Levels, Hue and Saturation, and a black brush to get the look you want. I often set my stars to a faintly blue color, dim the glow layer a little, and use the black brush to darken some stars. At this point, you can do all the erasing and rubber-stamping in Greg Martin's tutorial.
So what's the trick? All the alpha channel business achieves a simple goal: it adds a faint glow to each star. That's all.
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