Gerber OMEGA CP Reference Manual page 379

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To create a cut line for black and white images
1 Import or open a black and white raster image (BMP, TIF, GIF, and JPG) in Composer.
2 Select the image.
3 Select Tools > Raster To Vector to open the Raster To Vector dialog box.
4 Enter a size in pixels in the Speck Size in Pixels (to Remove) text box.
5 Choose Low, Medium, or High from the Resolution group box.
6 Click OK. The image and cut shapes appear in Composer.
7 In the View menu toggle back and forth between Wireframe and Filled mode to view
the cut shapes.
The example below shows both the cut shapes and the original image.