y - the distance (in pixels) between the bottom edge of the original image and the bottom edge of the crop box. x - the distance (in pixels) between the left edge of the original image and the left side of the crop box. The area of the input image you want to keep. If you cannot see the mask input, ensure that the mask control is disabled or set to none.Ĭhannels from the fg input containing the image to key and composite.Ĭhannels from the bg input to composite over, and to calculate the spill suppression. By default, the Primatte effect is limited to the non-black areas of the mask.Īt first, the mask input appears as triangle on the right side of the node, but when you drag it, it turns into an arrow labeled mask. The foreground, or subject, image to key.Īn optional image to use as a mask. The background image to replace the blue/green screen in the foreground. Nuke provides unlimited Undo during this process. Primatte then uses these to adjust the polyhedron. Then, use Ctrl+click or Ctrl+ Shift+drag to select a single color or a range of colors from the Viewer. Alternatively, you can set operation to how you want to use the color samples, or use the left and right arrow buttons to step through all the operations. 
To use Primatte, click Auto-Compute to automatically sense the backing screen color, eliminate it, and even get rid of some of the foreground and background noise. This controls the polyhedron in colorspace that determines what pixels are in or outside the matte. Primatte keys are created incrementally by sampling single pixels, or a range of pixels, from a blue or greenscreen image.
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