Tutorial: Exploding Planet
Like some others, this tutorial is an implementation of an existing Photoshop tutorial.
Create a new image (700px * 700px) with a black background colour.
Download the attachment to this tutorial (right), open the JPG and copy the cracked soil (ctrl+c) into your new GIMP-File onto a new layer. Press CRTL+T to transform and type in 700×700 pixels. Now move the layer into the middle, so that everything can be seen.
Optional: To achieve an exact positioning, you can also use the alignment tool. Click the tool, click on the layer with the cracked soil. Now go to: “Relative to:”. Then click the icon for the horizontal and vertical middle each once – your layer should now exactly fit in the size of the image!
Now, stretch the active layer on a ball: Go to Filters / Map / Map object and select “sphere”. See the settings in the picture below. In the “light” tab select: No light.
Invert the colors (Color / Invert). You will get a blue and white sphere:
We will now add the exploding rays. For this we first need the sphere streched on the layer: Filters / Distorts / Polar coords. Disable the bottom-right checkbox “To Polar”. Click OK.
Then go to Image / Transform / Rotate 90° CW.
Click Filters / Distorts / Wind with the values:
Edge affected: Leading
Use the filter again by pressing CTRL+F.
Now we must undo the stretching from before to get our sphere:
- Turn the Layer by selecting Layer / Transform / 90° CCW. It should now be on the top side.
- Now select Filters / Distorts / Polar coords. Check the box for “To Polar” again.
Then it looks quite cool. Take the Select Eliptical Regions tool (Key E) make a selction around the planet – invert this and cut the white edge away.
After that go to Select / None to make the existin selection dissappear.
Press CRTL+B to make the tool window appear – then L to activate the Gradient tool. Search for the gradient seen on the picture.
Turn it around and go to Colors / Map / Gradient Map and you have your exploding planet!
Optionally, you could duplicate the planet layer. Soften this layer with the value 11, turn the transparency of the layer to 65% and change the layer mode to “screen” or “color”. Thus, it reached a little more color intensity and softer transitions. Have fun with it.
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