Post-Processing Tips & Tricks
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25-05-10, 02:18 PM
Join Date: Jul 2009
I've been fiddling around with a shot I took of Guildford cathedral and I've managed to make some relatively convincing fake stars...
They're quite hard to see in the small version so it's worth clicking through to see it bigger. Rough details on how to do it below... I did this in Photoshop CS3 but it should be possible in Elements too (I think).
- Create a blank layer and fill it with black
- Use Filter>Noise>Add Noise. I used about 100%, Gaussian distribution. Also, tick "monochromatic"
- Go Filter>Blur>Gaussian. I found the "stars" a bit sharp. Around 0.2 - 0.5 should be enough
- Hide the stars layer and select the sky on the background layer, then turn the stars layer back on
- With the selection of the sky still active, add a layer mask to the stars layer. You should see the foreground.
- Change the blending mode of the stars layer to either screen or colour dodge (whichever looks better)
- Add a clipping mask levels layer and adjust the sliders until the stars look a bit more "real"
- Add a clipping mask hue/saturation layer and tweak the hue slider
That should just about do it. I'm refining the method at the moment so I'll update this once I've got it better (if I do!)
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