Create a new image that is 400x400 in width and height. Keep all of the default settings, and then click ok. You should now have a blank canvas with just a white background. We want to make sure the background colour is white else the whole thing doesn't work. To do this, reset your colours by pressing 'D' on your keyboard. Black should be your foreground colour, and white should be your background colour.
This isn't much yet, you may have noticed, so go to the menus at the top and go to 'Filter - Texture - Grain'. The best effect is to make the grain Intensity 100, and make the Contrast 50. To get the line effects as seen in The Matrix, select 'Vertical' from the Drop Down box. Click ok. You should now be seeing something like below.
Here comes the cool part. Press 'D' once more to make sure your Foreground colour is Black. This is compulsary! If it isn't, the whole effect would be... rubbish. When Black it is, go to 'Filter - Artistic - Neon Glow'. Change the Glow Size to 2, the Glow Brightness to 15 and change the colour to HTML Code '00FF00'. Click OK, and you should have something that looks like this spiffy image.
Now you can really see it's looking like the Matrix text, but the trouble is it's too blurry. We want to 'Sharpen' our image so the edges are more defined. But if you just use the Sharpen filter, it looks crap. So go to 'Filter - Stylize - Glowing Edges' to bring up a dialogue box. Change your Edge Width to 1, Edge Brightness to 5 and Smoothness to 1. Press OK, and you're done! Doesn't it look awesome? Here's my finished picture.





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