If the saturation of the pixel in the image is as strong or greater than the screen color, then it’ll be a pixel from the blue screen background, and that pixel is set to completely transparent and black. Picking different colors gives different results. Tip:It’s worth sampling a selection of screen (blue or green) colors and viewing the result. It removes the screen color from the pixel, a process known as despilling. It calculates the transparency of that pixel and puts it in the alpha channel. Keylight uses this comparison to do two things. Once the screen color has been picked, Keylight analyzes all the pixels in the image and compares the saturation of the primary component in each of these pixels with the corresponding saturation of the screen color. It has a primary component, blue or green, and that has a saturation. It also sets the Screen Balance and despills the foreground. Picking the Screen Color creates the screen matte used to composite the foreground over the background. Tip:You can discard sampled pixels by Ctrl/ Cmd+right-clicking in the Viewer. This means that you can pick the blue screen color even if you are viewing the matte, status or composite. Note:If you press Alt when sampling a color, Nuke always samples the source image regardless of what you’re looking at. The first thing you should do when pulling a key is pick the Screen Color. The screen color represents the color of the pure blue (or green) screen.
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