In viewing conditions, if viewer distance remains unchanged, what should happen to the image size as the %EH decreases?

As the percentage of effective height (often denoted as %EH) decreases, it indicates that the image's effective height in relation to the viewer's field of view is becoming smaller. In other words, while the viewer distance remains constant, a smaller %EH suggests a relative decrease in the perceived size of the image from the viewer's perspective.

To maintain the same level of visibility and engagement with the image at a fixed viewer distance, the image size must be adjusted accordingly. Increasing the image size compensates for the decreased %EH, allowing the viewer to perceive the image with the intended clarity and impact. This adjustment helps ensure that the content displayed remains easily viewable and effective for the audience, enhancing their experience.

In contrast, the other options would not address the relationship between %EH and the perception of image size effectively. If the image size were to remain the same or be decreased, it would further hinder visibility, while claiming that size is dependent solely on viewer distance would overlook the integral role that %EH plays in image presentation.