Первод делался по хелпу из 8-го флеша:
Цитата:
sourceChannel:Number - The source channel. Use a value from the set (1,2,4,8), which represent red, green, blue, and alpha channels, respectively.
destChannel:Number - The destination channel. Use a value from the set (1,2,4,8), which represent red, green, blue, and alpha channels, respectively.
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Как видно, фразы "or a sum of any of the values" там не было.