After selecting with the Magic Wand Tool, I wish to expanded the selection by a few pixels (at full resolution) to avoid leaving a white halo around the object due to aliasing.
How can I expand the selection by a few pixels?
You can access GROW command from the image menubar through Select → Grow.
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2Yes and no... The selection you add is "binary", the pixels get either fully selected or not selected at all, so when you us [delete] or
Edit>Clearthe end result is jaggy. Growing the selection is fine, but the background, or at least the part close to the extracted subject (your white halo), should not be removed byEdit>Clearbut byColors>Color to alphato transform the pixels with intermediate colors into pixels with partial transparency. – xenoid Mar 22 '17 at 20:59
