Out-of-focus photographs and most digitized images often need a sharpness correction. This is due to the digitizing process that must chop a color continuum up in points with slightly different colors: elements thinner than sampling frequency will be averaged into an uniform color. So sharp borders are rendered a little blurred. The same phenomenon appears when printing color dots on paper. As we can see, the demosaic affects proved to be better since the bricks were definitely more accurate. Yet, we have to remember that they do not lose, or increase any detail in comparison with the original image since the two can be computed with the inverse convolution matrix