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The design factors are considered for a parametric image converter operating from the infrared to the visible. Means are proposed whereby broad-band, high resolution, high efficiency picture conversion might be obtained, and calculated performance figures are given for a hypothetical system based upon lithium niobate. These figures are compared with previous experimental ones obtained by the author and with those for a scanning photodetector system. It is concluded that an image converter competitive with existing systems in the 1 to 10-μ band might be built and made operational.