1. For converting to electrical signals an image area having a range of light intensity values at the area, apparatus comprising: an X-ray source; a scintillation screen having an image area responsive to X-rays from the source to produce a secondary, light image at the area; two or more electro-optical means viewing the image area and including optical means distributing light from the image area including optical means simultaneously separating the secondary image into at least two images with different intensity patterns and directing the different images simultaneously on separate paths, and at least two photoelectrically responsive means, one in each path, and each generating electrical area signals respectively corresponding to light intensities from the area viewed.