A holographic image display system comprising: a coherent, or a partially-coherent light source ; a spatial light modulator illuminated by the coherent, or partially-coherent light source; a processor configured to drive the spatial light modulator with output hologram data, the processor receiving image data at an input and producing output hologram data based on the image data, wherein the image data comprises three-dimensional image data that is separable into a plurality of two-dimensional image layers at different image planes, and wherein the processor is configured to: a) perform a Fourier transform on each image layer to provide a transformed image layer, b) apply a focus factor to each transformed image layer, c) apply a pseudo-random phase factor to each transformed image layer wherein the pseudo-random phase factor is constant across each transformed image layer, and d) sum the transformed image layers to form a holographic sub-frame, e) repeat steps (c) and (d) for a plurality of iterations, applying a different pseudo-random phase factor to the transformed image layers in each iteration to form a plurality of holographic sub-frames, the plurality of holographic sub-frames forming the output hologram data; and f) drive the spatial light modulator with the holographic sub-frames in rapid temporal succession. a coherent, or a partially-coherent light source ; a spatial light modulator illuminated by the coherent, or partially-coherent light source; a processor configured to drive the spatial light modulator with output hologram data, the processor receiving image data at an input and producing output hologram data based on the image data, wherein the image data comprises three-dimensional image data that is separable into a plurality of two-dimensional image layers at different image planes, and wherein the processor is configured to: a) perform a Fourier transform on each image layer to provide a transformed image layer, b) apply a focus factor to each transformed image layer, c) apply a pseudo-random phase factor to each transformed image layer wherein the pseudo-random phase factor is constant across each transformed image layer, and d) sum the transformed image layers to form a holographic sub-frame, e) repeat steps (c) and (d) for a plurality of iterations, applying a different pseudo-random phase factor to the transformed image layers in each iteration to form a plurality of holographic sub-frames, the plurality of holographic sub-frames forming the output hologram data; and f) drive the spatial light modulator with the holographic sub-frames in rapid temporal succession. a) perform a Fourier transform on each image layer to provide a transformed image layer, b) apply a focus factor to each transformed image layer, c) apply a pseudo-random phase factor to each transformed image layer wherein the pseudo-random phase factor is constant across each transformed image layer, and d) sum the transformed image layers to form a holographic sub-frame, e) repeat steps (c) and (d) for a plurality of iterations, applying a different pseudo-random phase factor to the transformed image layers in each iteration to form a plurality of holographic sub-frames, the plurality of holographic sub-frames forming the output hologram data; and f) drive the spatial light modulator with the holographic sub-frames in rapid temporal succession. <EOS>