1. A color imaging system for producing a composite color image of an object, the color imaging system comprising: image-forming optics that form a chromatically aberrated optical image of the object; a sensor array positioned to capture color pixels of the chromatically aberrated optical image, the sensor array having an effective pixel pitch for the color pixels of less than approximately 30 μm, the color pixels comprising native color channels that correspond to different color bands within the chromatically aberrated optical image, each color band having a peak wavelength, wherein spectrally adjacent color bands are misregistered at their peak wavelengths by at least two effective pixel pitches along a tangential direction at the edge of the sensor array; and a processing module communicatively coupled to the sensor array for producing a composite color image from the native color channels, the processing module including: a color registration module that registers different color channels of the image to each other; and a spatially-varying sharpening filter that sharpens at least one component channel of the image.