1. A method of operation within a digital sensor having sub-diffraction-limit (SDL) pixels, the method comprising: exposing the SDL pixels to incident light; reading out pixel values that indicate respective exposure states of the SDL pixels; and generating an output image corresponding to the pixel values, including: grouping the pixel values to form a plurality of arrays of pixel-value groups, each of the arrays of pixel-value groups including a respective plurality of pixel-value groups in which each of the pixel-value groups is constituted by a respective subset of the pixel values, wherein groupings of the pixel values within each of the arrays are different from groupings of the pixel values within each other of the arrays such that each of the arrays includes at least one pixel-value group not included in any other of the arrays; selecting one of the pixel-value group arrays according to a predetermined image characteristic; and generating the output image from the selected one of the pixel-value group arrays.