Things You Will Need
It's possible to reduce the gloss of the paint in both instances.
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Wash the wall. If you are adjusting the gloss of paint already on the wall, wash it first with warm water, a soft rag and a mild soap. Do not scrub. Let the wall dry overnight.
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Sand the surface of the wall. Use a 400-grit sandpaper for a very flat finish, or a 1000-grit paper for a finish with a slight sheen. This will remove the top, glossy layer of paint. Use an electric sander for best results, protecting nearby furniture and items.
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Glaze the wall. If you don't wish to sand the wall, try painting a layer of a matte glaze over the paint. These glazes come in a variety of colors and textures. You can also add a texture to the wall by using a special roller to paint a pattern over the glossy paint. Choose a similar color as the glossy color.
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Change the lighting in the room. Reducing the light will make the walls appear less glossy.