The alpha bitmap has a width of mainimage.width/3 +1 and a height of mainimage.height. Using DrawImage you should be able to crop the main image starting at an x that is a multiple of three and crop the alpha bitmap to match starting at x/3 with a length of newmainwidth/3 + 1. As the vertical resolutions are the same use the same y start and height for both.
I don't think resizing will work without giving you some edge effects but you could try and see what it looks like.
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