alpha channels. These are typically represented as numbers in the
range 0.0 to 1.0. The output of the algorithm also has these same four
channels, with values computed from the source and destination.</p>
<p>The documentation of each value below describes how the algorithm works. In
each case, an image shows the output of blending a source image with a
destination image. In the images below, the destination is represented by an
image with horizontal lines and an opaque landscape photograph, and the
source i