Yes they do. Visually they will impart a colour specific to the filter to the viewing but should enhance the contrast to make some parts of a nebula visible. Amount of effect obviously depends on the object and the filter colour.
Photographically of course you can process the colour bias out removing the light pollution effect and get to a nore 'normal' colour pic. But you will probably need to compesate for the reduced exposure with longer times or higher ISO settings etc.
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