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    $\begingroup$ Well, that's certainly undesirable! Alpha compositing is supposed to be associative (i0~ImageCompose~(i1~ImageCompose~i2) should equal (i0~ImageCompose~i1)~ImageCompose~i2) and this doesn't do that. One could implement correct alpha compositing manually using ImageApply, but let's see if someone has a better way. $\endgroup$ Commented Sep 18, 2014 at 20:57
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    $\begingroup$ I imagine that the documentation was updated just as a result of an automatic processing, and not to show a new/different functionality. Just to make sure that WR will eventually correct the function to our expectations, I think you should send a bug report update, stating that now, not only the function is giving the wrong result, but also the documentation is showing the bug ;-) $\endgroup$ Commented Sep 20, 2014 at 16:25
  • $\begingroup$ @Rahul It would be nice if you post such an implementation. $\endgroup$ Commented Sep 21, 2017 at 17:17
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    $\begingroup$ @Alexey Sorry, I don't have the time to do it right now, but the definition of the "over" operator is on the Wikipedia page if you want to take a stab at it. $\endgroup$ Commented Sep 21, 2017 at 18:10