Perhaps this example (showing a variety of techniques) will be of 
assistance:

https://groups.google.com/forum/#!search/authormsg:fametest,RtVO9WT4U50J$20after:2011$2F4$2F1$20before:2011$2F5$2F1%7Csort:date/android-developers/llVSftDzGFM/KoHt5eFYRqEJ

Among other things, it uses AvoidXfermode to select magenta pixels to be 
replaced with transparent.

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