Compositing with alpha

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1 total messages Started by Grant J. Munsey Fri, 20 Nov 1992 23:26

#1859

Author: Grant J. Munsey
Date: Fri, 20 Nov 1992 23:26

9 lines
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Anyone know what the formula is for determining the value of a pixel
when a color is composited into it. I'm talking about the case where
both pixels have rgb and alpha channels. I understand how to do the
color components but I'm stumped on what the final alpha value is. An
example take a color red with .5 alpha {1,0,0,.5} and composite it into
a pixel with gray and .2 alpha {.5,.5,.5,.2} what is the result {?,?,?,?}.
----
Grant Munsey, Mainticore, Inc. (408)252-1135
grant@Manticore.COM,  uunet!ub-gate!gouche!grant   NeXTMail ok.

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