As already mentioned above, combining multiple images with software is not equivalent to a multi-shot capture digital back. The multi-shot digital back guarantees physically captured information for the Red, Blue, and Green at every spatial location. There is no interpolation of "missing" pixel information with a muti-shot capture back; all three color channels (R, G, B ) are produced from physically measured data. On the other hand, software that combines multiple images is working with interpolated pixel information, since each of the captured images is first interpolated to obtain the missing pixel information. Therein lies the difference; with the multi-shot back, 100% of the pixel information is physically measured. With software combining of images, only one-third of each image is physically captured, and guessed pixel information (via interpolation) enters into the process.