Abstract: An improved image reproportioning system is of the type for reproducing an image from an image bearing sheet onto a photosensitive sheet so that the scale of one dimension of the reproduced image can be changed relative to its other dimension. The system comprises a first sheet supporting member for supporting one of the sheets, and a second sheet supporting member for supporting the other of the sheets in substantial juxtaposition with the first sheet. The system also includes means for defining a slit of light, and means for moving the first and second sheet supporting members at a substantially constant speed in a first direction parallel to the direction of the one dimension and transverse to the slit of light so that the sheets pass through and are exposed by the slit of light. Means are also provided for moving the first and second sheet supporting members relative to one another at a substantially constant relative speed as the sheets are exposed to the slit of light.