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Tutorial: Starry Sky

By Dirk Metzmacher

If you’re somebody who doesn’t look up to the night sky very often, then you can also create stars, gas clouds and the bright band of the Milky Way in Photoshop, using nothing but a few filter combinations.

The starry sky displayed here might be a little over the top, but a photorealistic result was never the objective – we wanted a fantasy product instead.

Starry sky tutorial

1. Some stars for starters

Fill the background layer with black, then create a new layer with Layer > New > Layer via Copy or Ctrl+J. To build a base for the starry sky, use Filter > Noise > Add Noise with an Amount of 10% to 20%, Gaussian Distribution and Monochromatic.

Duplicate the layer with Layer > New > Layer via Copy or Ctrl+J and apply Image > Adjustments > Brightness/Contrast, (Use Legacy), Brightness -40 and Contrast 80.

2. Rough stars

Copy the layer with Ctrl+J, then double its size with Edit > Transform > Scale or Ctrl+T. You can use the options panel to enter 200% for Width and Height and confirm with the Enter key. Use Image > Adjustments > Brightness/Contrast, Use Legacy, Brightness -20 and a Contrast of 70 to make some rough stars.

Duplicate this layer as well, then blur it with Filter > Blur > Gaussian Blur and a Radius of 2 pixels. Bring out the stars with Image > Adjustments > Brightness/Contrast, Use Legacy, Brightness 0 and a Contrast of 70. Then apply the Gaussian Blur a second time.

3. Starry sky

Set the blending mode of the top-most layer from Normal to Linear Dodge, and all the other layers to Screen. The starry sky appears, but it’s still too strong and too uniformly distributed.

You could go and take the Eraser tool to remove a couple of stars from each layer.

If you want to play it safe and make sure to be able to quickly correct errors later on, give each layer a layer mask with the Add Layer Mask button at the lower left corner of the layer palette, then use the Brush tool and a black color to paint certain areas and thereby make them invisible. White color easily corrects any mistakes.

4. Preparation for the gas clouds

After you’ve created a new layer and filled it with black, use Filter > Render > Difference Clouds repeatedly until you can see a nebula of some kind. Filter > Render > Lighting Effects with Style: RGB Lights instead of Standard gives you a bit of color in the cloud.

Click each of the lights, position them and adjust their strength by scaling the oval up and aligning it. Confirm with OK and see how the nebula turns into a more colorful variation.

5. Weaving the gas cloud in

Set this layer’s blending mode to Linear Dodge, then just like in the stars‘ layers erase some areas, or make them transparent via the layer mask, respectively.

6. Lens flares

Filter > Render > Lens Flare is used to simulate closer stars that appear larger. Create a new layer, fill it with black and set the blending mode to Linear Dodge. Apply the filter with a Brightness value of about 70% and Lens Type 105mm.

Result: Starry sky

In case the new star is not exactly where you want it to be, you can easily reposition the layer with the Move tool. A perfectionist would use Image > Adjustments > Hue/Saturation, check Colorize and adjust the sliders to change the star’s appearance further.

Of course, several of these large suns, each on their own layer, could be colorized differently.

http://www.photoshop-weblog.com/tutorial-starry-sky/