When calculating throw distance, which parameter is necessary along with width?

In calculating the throw distance for a projector, the necessary parameters include the width of the image and the height of the screen. The throw distance is determined by the size of the image that the projector is supposed to produce on the screen, which is defined by both its width and height.

By knowing the screen height, along with width, you can better understand the dimensions of the projected image and how far the projector needs to be placed from the screen. The relationship between the width and height allows you to apply the aspect ratio correctly, which further ensures that the image is displayed accurately on the screen.

While other parameters such as lens type and maximum height can influence the projection setup, they do not directly establish the relationship needed to calculate the throw distance in conjunction with image width. Therefore, the screen height is essential for accurate calculations concerning projector placement and image projection dimensions.