Mike Rankin explains what Parametric Brushes are and how to make your own custom Parametric Brushes in GIMP. Options including the shape: circle, square, or diamond, radius, hardness, aspect ratio, spacing, and spikes are all discussed.
- [Narrator] GIMP comes with a basic set of sample brushes that can get you started but it's probably not gonna be long before you'll wanna create an entirely new brush of your own. The process isn't hard but it's different for the various brush types. So in this movie, we'll see how to make custom parametric brushes. To create a new brush, I need to open the brushes dialog which I'm gonna do by taking any tool that uses brushes and opening the brush menu and then clicking the brush button at the bottom. Then I'll click to button to create a new brush.
This brings up the brush editor where I can set some parameters starting with the shape. I can start with a circle, a square, or a diamond. I'll choose the circle and then I have six parameters that I can adjust to customize this circle. Starting with the radius which is the distance from the center to the edge. I'll make that 100 pixels and then I'll press tab to highlight the next value in the slider. And you can see that the preview immediately updates. I'm gonna skip over spikes for now and get back to it later.
I'll press tab again to set the hardness. Hardness is how sharp or blurry the edges of the brush are. At the highest value of one the edges aren't blurred at all. At a value of zero, the blur extends all the way to the center of the brush. I'll set my brush at one and move on to aspect ratio. Aspect ratio is the measure of width to height. So at a value of one, we have a perfect circle. At a value of two, we get an oval that's twice as wide as it is tall.
I'm gonna set the aspect ratio in this case to three. Angle allows you to rotate your brush from zero to 180 degrees. I'll set it to zero in this case. And spacing, as we've seen in other movies, is how far apart each brush mark is from the previous one. And this number is a percentage of the width of the brush. So at 100, each brush mark would just touch the previous one without any overlap. For smooth brush strokes, reduce this to a low value.
In most cases, something less than 20 but for this brush that I'm making I'm gonna use a really big value to space it out. 200. Now I'll go back to spikes. Spikes allows you to add points to your brush shape. I'll use nine. And with spikes, the aspect ratio value controls how pointy the spikes are. Zero eliminates the spikes totally and higher values makes the points more noticeable but again I'll go back to a value of three.
Now all I have to do is give my brush a name. I'll call it flower. And back in the brushes dialog it will appear as one of my choices. Notice in the tool brush options though it's still called untitled at this point. I have to actually switch to a different brush and then back to my custom brush to see the new name. So now to use my brush I'll make sure I have the paint brush tool. I'll reset the brush options and for this particular image I'll use a really big brush with a size of 400.
And I'll click the dynamics button and choose the random color and size dynamics that I created in a previous movie. In dynamics options, I'll make sure that I'm using the foreground to background gradient and I'll use the color picker tool to set the foreground color to a pink color from the girl's shirt. I'll hold down the command or control key to set the background color to a yellow color from the flower. Then in the layers dialog, I'll target the background layer take my paint brush tool and drag to create a flowery background.
So that's an example of creating a custom parametric brush which you can really enhance by combining it with brush dynamics.
- Navigating the GIMP interface
- Creating and saving documents
- Working with selections
- Using Quick Masks
- Adjusting images with Curves and Levels
- Working with text and paths
- Working with colors and brushes
- Configuring brush keyboard shortcuts
- Enhancing photos with filters
- Outputting images
Skill Level Beginner
1. Getting Started
2. Working with Selections
3. Working with Layers
4. Working with Masks
Creating layer masks6m 43s
5. Working with Paths
6. Adjusting Images
7. Using the Paint Tools
8. Retouching Photos
9. Working with Filters
10. Working with Text
11. Outputting Images
Next steps1m 7s
- Mark as unwatched
- Mark all as unwatched
Are you sure you want to mark all the videos in this course as unwatched?
This will not affect your course history, your reports, or your certificates of completion for this course.Cancel
Take notes with your new membership!
Type in the entry box, then click Enter to save your note.
1:30Press on any video thumbnail to jump immediately to the timecode shown.
Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote.