Juxtaposing several projector channels is a viable method of meeting the "wide angle field-of-view" requirement of many training simulators. Blending overlapped images on a dome surface can be done either optically by using lenses and optical filters or electrically by "rolling-off" the video signals at edge boundaries. The quality of edge-blending between projector channels can be evaluated by quantifying parameters like: registration accuracy in the overlap region, color match between adjacent channels, intensity variation across the edge boundary, brightness uniformity across the entire viewing area, and exit-pupil size. In some simulators wide exit-pupils (more than one eyepoint) are required. In these cases the quality of edge-blending is largely determined by the gain characteristics of the screen material used.