![]() They show you the parts of the alpha that have changed through processing the alpha channel (clipped, softened, or eroded). The figure on the left shows black, white, gray, and green pixels. You may occasionally see other colors in the Status view. Gray pixels do not mean the key is poor - the final composite may be fine. The gray is just one color to highlight any areas that are not pure foreground or background. Gray pixels are a blend of the foreground and background pixels.Black pixels represent pure background in the final composite.The figure on the right shows the Status after the screen color has been picked from the image shown in the figure on the left. Status is one of the options in the View dropdown menu and shows an exaggerated view of the key so that you can make a more informed decision when fine tuning the composite. Composite - this renders the foreground composited over the background using all mattes, spill and color corrections.There’s an Unpremultiply Result toggle you can use if you wish. Final Result - this creates a premultiplied RGBA foreground that can be composited later. ![]() In Keylight nodes down the tree, you should set the Source Alpha in the Inside Mask folder to Add To Inside Mask. This renders the original source image with the Screen Matte generated in this Keylight node. Intermediate Result - use this option on shots that can only be keyed using several different keys on different parts of the image (multi-pass keying). ![]() Status - this renders an exaggerated view of the key so that minor problems are shown clearly.Combined Matte - the screen matte, inside mask, and outside masks added together.The outside mask is used as a garbage mask to reveal the background. Outside Mask - shows the outside input.This is used to firm up the foreground matte to stop print through. It does not include any inside or outside masks. Screen Matte - this is the matte created from picking the Screen Color.Source Alpha - shows the alpha channel on the foreground input.Source - shows the blue/green screen foreground. ![]() Two options, Screen Matte and Status, are for viewing the key rather than an output. The View parameter allows Keylight to render the final composite of the foreground over the background, or the foreground RGBA for compositing further down the tree. Keylight is a ’color difference keyer’, which means that for it to figure out a key, it compares every pixel in the image against a single color, known here as the Screen Color. Basic parameters covered previously may also be covered here in more detail. The following section describes how Keylight works under the hood as well as the parameters you need to fine tune keys and get the most out of Keylight. ![]()
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January 2023
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