The term image offset is used in projection technology
. It is the deviation of the center axis of the projection lens relative to the total image height. The image offset is given as a percentage and can be 100% or more, namely when the center axis is outside the image area. If the projector is mounted on a table, the image offset refers to the lower image border, if the projector
is mounted on a ceiling, the image offset refers to the upper image border.
. It is therefore 100 %. If the projection lens isbelow the lower image boundary - assuming 10 % below the lower image edge - then the image offset is 10 % plus 100 % of the total image height.
Generally, trapezoidal distortions also occur during image offset; namely when the projected light does not strike the projection screen perpendicularly and in the center of the image.