is called the composited image.

Consider three pixels;
* a foreground pixel, f
* a background pixel, b
* a composited adetpixel, cand
* ?, the opacity value of the foreground pixel. (? = 1 for an opaque foreground, ? = 0 for a completely transparent foreground). A monochrome raster image where the pixel values are to be interpreted as alpha values is known as a matte.

Then, considering all three colour channels,

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