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Micro-Organisms
How to make a realistic microscopic world that strongly resembles a photo taken from a microscope.

Step 1
Open up a new document with a white background. The size doesn't matter in this tutorial, but I will be using 400x400.

Step 2
Reset your colors to black and white by pressing
D on your keyboard. Now go to
Filter>Render>Clouds then
Filter>Render>Difference Clouds. Your image should resemble the following:

Step 3
To create the "micro-organisms," go to
Filter>Sketch>Reticulation and use the following settings:

Step 4
Now we're going to bring them out and make them look more realistic. Go to
Filter>Stylize>Find Edges and your image should look similar to the following:

Step 5
Now to round everything off and add to the realism, go to
Filter>Stylize>Glowing Edges and use the following settings:

Step 6
For the last step we're going to add some color to it. Hit
Ctrl+U on your keyboard to bring up the colorize box. Be sure to check the
Colorize box. Mess around with the settings to get something of your liking. I used the following settings:

My final image after adding some text...