Abstract: An image edge blender (58) of this invention installs in an unmodified projector (50) in place of the projection lens (52), which then installs at the output end of the image edge blender assembly. The image edge blender includes a relay lens (64) that relays an objective image plane (66) formed in the projector to an intermediate focal plane (68) formed within the image edge blender. An adjustable aperture assembly (70) includes at least one shutter (96) positioned at or near the intermediate focal plane and movable in rotational, parallel, and transverse directions relative to-the optical axis (78).