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Summary: To make graphics brushes in Gimp, create the desired shape in black, crop the image to the selected shape, and save the image as a Gimp Brush file, or a GBR. Create custom brush tool shapes with tips from an experienced graphic artist in this free video on graphic design.
"Okay, now I'm going to show you, if you've ever seen the program GIMP it's kind of like a free image kind of manipulation program, a little bit like Photoshop I guess, that is an open source program you can find online. I'm just going to quickly show you how you'd make your own like deck to brush using GIMP. As you can see I've just started a document here real quick. I've just used the circle eclipse over here, drew out a circle, filled it with black using the paint, what do you call it? The paint bucket over here. Over here you've got your layers and what not. But, say we just want to make this circle here, or brush so what we do is just go to select, and select it all and you want to make sure it's, so you're picking out what you want. You want to go down and crop this selection. Say you had it any bigger than that you're not picking up any of the excess around the circle you've got here and simply to make this a brush to use go to file, go to save as, and down here you've got these two little arrows, just select file type by extension and you should get a whole bunch of different options over here and what you want to find is this one, the GIMP brush, the GBR. So you know, call that you know, circle and save it. And make sure it's saved in the brush folder, in your GIMP program files otherwise next time you boot up GIMP it won't come up in your brush folder on this side over here. So yeah that's how you go about making a deck to brush in GIMP."
eHow Article: How to Make Graphics Brushes