Selecting pixels on the outer edge of an item?

When making a selection with either a lasso or Magic Wand, it seems to select the item, however, when I zoom in, there seems to be lots of soft pixels on the edges of the items that are not being included in my selection.
What is the best way to get these outer pixels that have different colors and levels of transparency?
Thanks!

Those pixels may be only partly selected. A selection is just a mask, which is used to limit your edits to only he masked (or selected) area. If you, for example, fill a selection with white, you are just replacing the masked pixels with white. Some pixels can be partly selected, which would result in the white fill not being completely opaque. A 50% selected pixel would end up with a 50% white fill, effectively making it 50% less bright. For example, a red pixel (255,0,0) would become pink (128,0,0).
Photoshop’s marching ants, as they have been called for decades, can only show whether an area either is or is not selected, it can’t show the level of selection. You can view the selection as a mask by pressing Q, invoking QuickMask. Now if you zoom into the edge of your selection you will see that those pixels near the edge are partly selected.
If you don’t want partially selected pixels, then you can turn off Anti-alias in the tool options panel at the top of the screen.

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Selecting pixels on the outer edge of an item?

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