The range of brightness in a Projector Screen image is determined by the ambient light conditions, the luminous power of the projector, and the size of the image being projected. In the presence of ambient light, a bigger screen size equals less luminous (luminous power per unit solid angle per unit area) and hence less contrast. When an image is projected, some light is always created in the room, raising the ambient light level and so contributing to the degradation of picture quality. This effect can be mitigated by using dark colors to decorate the room. The real-world situation differs from the contrast ratios provided by projector makers, who record the light levels with the projector set to full black / full white, resulting in a high contrast ratio Adios as possible.
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