Which lighting factor primarily influences the visibility of projected images?

Ambient light is the primary factor that influences the visibility of projected images because it can wash out the colors and contrast of the projection. When there is significant ambient light in a room, it competes with the light from the projector, making it difficult for viewers to see the image clearly. A well-implemented projection system needs to take into account the surrounding light conditions, as too much ambient light can significantly reduce the effectiveness of the projection, regardless of the screen size, projector resolution, or viewer distance.

While other factors like screen size can affect how large the image appears and viewer distance can influence the perceived clarity, they do not impact the inherent contrast and visibility of the projected image to the same extent that ambient light does. Additionally, projector resolution plays a role in image detail but does not directly relate to how well the image can be seen when competing with ambient light. Hence, managing ambient light is crucial for ensuring optimal viewing conditions in any projection scenario.