The distortions in the perceived image from a stereoscopic image pair displayed on a screen are analyzed for different conditions of photographing, projecting, and viewing for the cases of both a stereo camera and a stereo projector with a parallel configuration. The conditions used for the analysis are positions and stereo bases of viewer and the camera and magnification of the displayed image. The possible location of the image is also found for given locations of the camera and the viewer. The obtained resulted can be used to optimize stereo image display systems. (C) 2002 Society of Photo-Optical Instrumentation Engineers.