Abstract: The invention concerns a thermal printing ribbon for an office printer and bearing a sequence of coloring areas (3-7) that serve to print a picture in at least one printing zone onto a printing support sheet of specified format. The formats of the consecutive coloring areas (3-7) that serve to print a printing zone are substantially sub-multiples of the format of the printing support sheet but significantly different one from another.The invention is appropriate for color printing by thermal transfer.

Abstract: A cassette for thermal-transfer printing ribbon (2), designed to be fitted in a printer comprising a printing head (21) in front of which sheets of paper (30) are intended to pass and comprising a housing (3; 103) for accommodating a delivery spool (4; 104), a housing (5; 105) for accommodating a take-up spool (6; 106), means (8; 108) designed to be driven in rotation and drive the take-up spool (6; 106), a window (9; 109) being made between the two housings (3, 5; 103, 105) and designed to allow interaction of the printing head (21) and the ribbon (2) extending between the two housings (3, 5; 103, 105).