This tutorial takes NO gfx skills at all, trust me, I can do it.
You need GIMP to do this tutorial, it can be downloaded here:
Code:
http://www.gimp.org/downloads/
Step 1, Make Image
This is the very simple method to follow:
* Open gimp.
* Set Foreground color to Black (it should be black by default)
* In menu, select File --> New
* In Create a New Image, select the desired resolution.
* Also set Advanced --> Fill Select to "Foreground Color"
* Optional: Click on greyscale bar and set the gradient to something else. This can produce mixed results.
* Press OK
On the Menu for the image, select Filters --> Render --> Nature --> Flame
Step 2, Setting up Flame
* Goto tab Camera and set Zoom to "3"
Optional: Use "1.5" for higher speed.
* Click Edit
* In the "Edit Flame" dialog, set Variation to "Spherical".
Optional: Sinusoidal also works well at a high zoom.
* Now you must look at the nine boxes. If you like a pattern, choose it. If not, click Randomize. Note, this may be slow.
* When a suitable flame pattern has been chosen click OK.
* In the dialog "Flame" goto the Camera tab and adjust X and Y until you get an image that is fairly centered or otherwise looks good.
* Click OK. Wait a while. This step takes a while!
Step 3, Color Time
In this step, color is added. I guess you have to decide what color to use. Blue pretty much always works well, and Red rarely works very well as variations in red end up looking purple or yellow. Orange is another good choice. Green is not too hard to get working either.
* In the menu for the image, choose Colors --> Components --> Channel Mixer - in older version of gimp it's in Filters.
* Now, set Output Channel to the color you want to dominate in the image.
* Changing Red, Green, or Blue will make parts of the image that are those color become more or less of the Output Channel Color.
* Adjust the settings here until a desired look is obtained.
* Click OK
* In the GIMP Menu, Choose File --> Save As
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Your done making your cool background, You can also use this for sigs or basically anything, play around with it, you dont always need to use spherical. You can also make another layer, and make it look like you actually took time into making the picture, lol
Here's one I made using multiple layers: