I'm not sure, but my guess is that yes, you need to blacken the background. I spent a long time blackening in the area around the image I wanted to use when I did this. The nice thing is once this is done it is permanent, you can flash all the ROMs in the world and your custom boot logo will remain.
EDIT: Of course if you flash a stock SBF it would replace your boot logo with the "M" logo. But no ROM flashing or system updates will affect it.
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