Create a Rainbow Effect Wallpaper in GIMP


1) Open up a blank canvas, make sure the background is black. On a new layer get a medium-large brush and make random strokes with different colors (doesn’t matter what colors, they won’t show up. Just make sure they are nice and saturated) . Should have something like this now…
Image

2) Now go to filters>edge-detect>neon
Make the radius 30.72 and the amount 0.30
Hit OK
You should have something like this now…
Image

3) Now go to filters>edge-detect>edge
Algorithm should be ‘Sobel’
Amount should be 4.2
fill in the bubble that says ‘Smear’
Hit OK
You should have something like this now…
Image

4) Repeat the above two steps (2 or 3 times) until you get something like this…
Image

5) Now comes the motion blur.
filters>blur>motion blur
blur type: ‘linear’
length: 256
angle: 270
Hit OK

6) Do the above step 2 or 3 times, depending on how sharp you want your lines. You should have something like this afterwords…
Image

7) Go to colors>desaturate
select ‘Lightness’
Now it’ll look something like this…
Image

8) Go to colors>levels and move the sliders so that they look like this…
Image
Hit OK
It should look kinda like this now…
Image

9) Go to colors>curves and make the curve look like this…
Image
You’ll end up with something like this…
Image

10) Create a new transparent layer.
Get out your gradient tool. Make the gradient go from foreground to transparent and drag it from the bottom to the top. (You can use a bright color so you can see the gradient easier).
Go to the layers dialog box and right click the layer with the gradient. Go to ‘Alpha to Selection’.
Make sure you have the layer with you lines selected now.
Go back to your image.
Right click>edit>cut.
Now you can delete the layer with the gradient.
It’ll look something like this…
Image

11) Go back to your layers dialog box and right click the layer with the stripes. Press ‘Alpha to Selection’.
Create a new layer, go to your gradients tool again. Select the gradient from the list named ‘Full Saturation Spectrum CCW’
Go back to the image. Make sure your lines are still selected. Drag the gradient from the left side to the right side of the image. Set that layer on overlay and…
YOU’RE FINISHED!! YAY!!
Final product should look like this…
Image

Also:
If you want it to be white instead of black, just do colors>invert on the bottom two layers.

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