Abstract: A method, system and computer-readable medium for achieving a target compression ratio for binary images with a minimum of image degradation. Portions of the binary image are strategically replicated and used to replace adjacent portions of the image. This process is continued until a compressed version of the image data satisfies a target compression ratio.

Abstract: An ionographic printer directs a stream of ions from a source to a charge receptor to create an electrostatic latent image thereon. The ion stream passes through a relatively large aperture having associated therewith a pinch electrode for narrowing the ion stream to a preselected width, and displacing electrodes for positioning the narrowed ion stream within the aperture. Varying the biases of the displacing electrodes causes the ion stream to scan across the aperture to deposit multiple spots of charged areas at desired locations on the receptor. The electrodes can be designed to compensate for spot placement skew and anomalies in the cross-sectional shape of the displaced ion stream.