Which factor is most critical when determining image height for a viewer distance of 120 inches?

When determining image height for a viewer distance of 120 inches, assessing the detail of the content being displayed is crucial. The amount of detail in the content directly affects the perceived resolution and clarity of the image. For example, high-detail content, such as 4K video, may require a different image height compared to lower-resolution content to ensure that the viewer can appreciate the detail without straining their eyes. By considering the content's detail, you can optimize the image height for an enhanced viewing experience, accommodating factors such as the intricacies in the visuals that would be visible at that distance.

While screen resolution is also relevant, it primarily dictates the overall image quality rather than its specific height. Factors like viewer age can influence how someone perceives detail, yet it is not the primary determinant for calculating image height. Similarly, lighting conditions are important for visual perception but do not directly inform the optimal height of the image for a certain distance. Therefore, focusing on the detail of the content ensures appropriate sizing for optimal viewer engagement and satisfaction.