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"The Everything Manual" page 256
(sopuli.xyz)
one should not chase the electric dream
This community is for sharing original content related to computers, content, surrealism and wizardry.
Now that you're a surrealist, become a Techno-Mage:
The background is made from a plain purple color with added HSV noise. Then an effect is added on top of everything by copying the entire image into a new layer and applying a convolution with a kernel like this:
In GIMP those are under "filters > noise > HSV noise" and "filters > generic > convolution"