How to Make Halftone Stencils in GIMP
GIMP, the GNU Image Manipulation Program, makes it easy to create a basic custom stencil. GIMP can turn any image into a stencil, though images with a lot of detail and background will require more work than others. The problem with GIMP is that it does not render the edges as smoothly as professional halftone stencils. You can further smooth the edges of your image using a program that handles vector images, such as Inkscape, a free vector graphics editor.
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Instructions
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Remove any background elements that you do not want in your image. Stencils are best when simple but recognizable. You can use the magic wand tool to select parts of the background automatically.
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Go to Colors > Threshold and drag the arrow to the left or right to adjust the edges of your image. The image will update on the screen. If it does not, select the "Preview" option in the lower left corner of the Threshold window. Click "OK" to save the changes, and "Cancel" if you need to go back and further edit details of your image. If the colors are backwards, with a black background and white foreground, go to Colors > Invert to flip them around.
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Use the Eraser tool to clean up any lingering artifacts that you do not want for your stencil. If you need to fill white spots within the stencil, use the paint brush to touch them up.
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Save your stencil. If you intend to use it with Inkscape, save the image as a bitmap file with the .bmp file extension. If you want to use it as-is, you can save it in any image format, such as GIF, which can be easily opened on any computer or operating system.
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Tips & Warnings
To create a vector image from your GIMP stencil in Inkscape, open the BMP stencil in Inkscape. Click on the image and press "Shift + Alt + B" to open the "Trace Bitmap" window. Select "Edge Detection" and click "OK" to smooth your image.
GIMP can open and manage SVG files.
Not all images are suited to use as stencils. Small images, or images with poor contrast, may not look right. Images with a lot of detail may also be difficult to use as a stencil.
References
Resources
- Photo Credit Jupiterimages/Photos.com/Getty Images
