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If your talking about the blue that forms a thin halo around the object you want to isolate, it really won't. That halo is the threshhold of where the solid blue starts to blend with colours next to it. This happens most especially if the image was taken or scanned with a lower resolution.

If you really want to clean that out, it's tedious so patience is the key. Or you can use the blend or blur tools.

vee