A sheet feeder including: (a) a pair of feed rollers operable to have a plurality of successive rotational motions, so as to be rotated by a predetermined amount in each one of the successive rotational motions, for thereby causing a sheet nipped between the pair of feed rollers, to be fed along a feed path by a desired distance as a result of the each one of the successive rotational motions; (b) a back-tension applier disposed in the feed path, and configured to apply a back tension to the sheet that is fed along the feed path; and (c) a motion controller configured to control the successive rotational motions of the feed rollers, and to command the feed rollers to be rotated by a compensated amount that includes a supplementary amount in addition to the predetermined amount, in each of at least one of the successive rotational motions. Also disclosed is a process of feeding a sheet, by using the sheet feeder.