Titus and Phototitus are image light-valves based on the Pockels effect in a KD2PO4 crystal. The operation temperature has been chosen near the Curie point resulting in a reduction by more than tenfold of the modulation voltage required. Titus is addressed by means of an electron beam; Phototitus is optically addressed by means of a photocon-ductive selenium layer. Titus is well adapted to applications such as large screen television displays and remote image and data processing. As an example, a color television projection system is described which incorporates a 4 kW xenon lamp and three titus tubes. The performances are: highlight output 2800 lumens, resolution 750 elements per horizontal line, contrast 30/1 to 60/1. Because the electric charge pattern is stored between two successive scannings, the projected picture exhibits no flicker. In addition, no line structure is apparent. Phototitus is well adapted to image and data processing in non-coherent and coherent light. The performances are: resolution 75 lp/mm contrast 70/1, sensitivity 10 μJ/cm2. The linearity of the induced birefringence versus the applied field and the ambipolarity of selenium allow processing based on algebraic addition such that: temporal integration, subtraction, temporal and spatial differentiation of images. Examples are given.