1. An image processing system for combining at least a portion of a panchromatic image block at a first resolution with at least corresponding cogeolocated portions of n spectral band image blocks of a second resolution lower than the first resolution, the system comprising: circuitry for upsampling the corresponding portions of the n spectral band image blocks at the second resolution to form n upsampled spectral band image blocks, where n is an integer that is at least as large as four; circuitry for transforming the n upsampled spectral band image blocks to a hyperspherical color space to form hyperspherical color space image blocks including, for each pixel in the hyperspherical color space image block, a hyperspherical intensity and n−1 hyperspherical angles, wherein the n−1 hyperspherical angles are based on an inverse tangent of a square root of a sum of a decreasing number of squares of the n spectral image blocks; circuitry for intensity matching the intensities of the hyperspherical color space image blocks with intensities of corresponding pixels in the panchromatic image block to form intensity adjusted hyperspherical color space image blocks by filtering at least the intensities of corresponding pixels in the panchromatic image block to form the intensity adjusted hyperspherical color space image blocks; and circuitry for reverse transforming the intensity adjusted hyperspherical color space image blocks into n reverse transformed spectral band image blocks.