A method for accurately printing a target colour, the method comprising: in a first step measuring a light spectrum of a first printed colour sample, printed with a first ink coverage; and from the measured light spectrum calculating a colour discrepancy between the first printed colour sample and the target colour; and in a second step calculating an improved ink coverage by retrieving the minimum distance between coordinates of the reflectance spectrum of the colour sample and coordinates of the target colour, and printing a second colour sample with the improved ink coverage; and repeating the aforementioned steps until a predetermined condition for accuracy of the target colour has been reached, wherein the improved ink coverage is calculated using a colour model, the method comprising: calculating the current ink coverage of a printed colour sample, from the measured light spectrum, and on the basis thereof using the colour model to calculate a potentially improved ink coverage, wherein the method is repeated for each printed colour sample, to calculate the required change in ink coverage to accurately print the target colour, and, wherein the method further comprises: selecting a plurality of previously calculated improved ink coverages; using recent ink coverage linear combinations, calculating a new improved ink coverage for printing a colour sample; and selecting from the improved calculated ink coverages the ink coverage with the smallest associated colour discrepancy. in a first step measuring a light spectrum of a first printed colour sample, printed with a first ink coverage; and from the measured light spectrum calculating a colour discrepancy between the first printed colour sample and the target colour; and in a second step calculating an improved ink coverage by retrieving the minimum distance between coordinates of the reflectance spectrum of the colour sample and coordinates of the target colour, and printing a second colour sample with the improved ink coverage; and repeating the aforementioned steps until a predetermined condition for accuracy of the target colour has been reached, wherein the improved ink coverage is calculated using a colour model, the method comprising: calculating the current ink coverage of a printed colour sample, from the measured light spectrum, and on the basis thereof using the colour model to calculate a potentially improved ink coverage, wherein the method is repeated for each printed colour sample, to calculate the required change in ink coverage to accurately print the target colour, and, wherein the method further comprises: selecting a plurality of previously calculated improved ink coverages; using recent ink coverage linear combinations, calculating a new improved ink coverage for printing a colour sample; and selecting from the improved calculated ink coverages the ink coverage with the smallest associated colour discrepancy. calculating the current ink coverage of a printed colour sample, from the measured light spectrum, and on the basis thereof using the colour model to calculate a potentially improved ink coverage, wherein the method is repeated for each printed colour sample, to calculate the required change in ink coverage to accurately print the target colour, and, wherein the method further comprises: selecting a plurality of previously calculated improved ink coverages; using recent ink coverage linear combinations, calculating a new improved ink coverage for printing a colour sample; and selecting from the improved calculated ink coverages the ink coverage with the smallest associated colour discrepancy. selecting a plurality of previously calculated improved ink coverages; using recent ink coverage linear combinations, calculating a new improved ink coverage for printing a colour sample; and selecting from the improved calculated ink coverages the ink coverage with the smallest associated colour discrepancy.