From Bitmap.createBitmap:
"Returns an immutable bitmap from the specified subset of the source bitmap. The new bitmap may be the same object as source, or a copy may have been made. It is initialized with the same density as the original bitmap."
Pass it a bitmap, and define the rectangle from which the new bitmap will be created.
// Take 10 pixels off the bottom of a Bitmap
Bitmap croppedBmp = Bitmap.createBitmap(originalBmp, 0, 0, originalBmp.getWidth(), originalBmp.getHeight()-10);
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