A method of automatically identifying one or more digital representations of single- and/or few-layer thin-film material in a digital image, the digital image having a predetermined number of colour components, and the method comprising - determining a background colour component of the digital image for each colour component, and - determining or estimating a colour component of thin-film material to be identified in the digital image for each colour component, the thin-film material to be identified having a given number of layers being at least one, wherein determining or estimating a colour component of thin-film material to be identified in the digital image for each colour component comprises - obtaining a pre-determined contrast value for each colour component and determining or estimating the colour component of the thin-film material to be identified and having the given number of layers for each colour component by, for each colour component, multiplying a numerical difference between the pre-determined contrast value for a given colour component and about 1 with the background colour component for the given colour component, and wherein the method further comprises - identifying one or more digital representations of single- and/or few-layer thin-film material as points or parts of the digital image that, for each colour component, has a colour component being within a predetermined range of the determined or estimated colour component of the thin-film material to be identified having the given number of layers, characterised in that the obtained pre-determined contrast value for each colour component has been derived as: - the numerical difference between the colour intensity of the background of the given colour component and the colour intensity of the thin-film material to be identified of the given colour component divided by the colour intensity of the background of the given colour component. - determining a background colour component of the digital image for each colour component, and - determining or estimating a colour component of thin-film material to be identified in the digital image for each colour component, the thin-film material to be identified having a given number of layers being at least one, - obtaining a pre-determined contrast value for each colour component and determining or estimating the colour component of the thin-film material to be identified and having the given number of layers for each colour component by, for each colour component, multiplying a numerical difference between the pre-determined contrast value for a given colour component and about 1 with the background colour component for the given colour component, - identifying one or more digital representations of single- and/or few-layer thin-film material as points or parts of the digital image that, for each colour component, has a colour component being within a predetermined range of the determined or estimated colour component of the thin-film material to be identified having the given number of layers, characterised in that the obtained pre-determined contrast value for each colour component has been derived as: - the numerical difference between the colour intensity of the background of the given colour component and the colour intensity of the thin-film material to be identified of the given colour component divided by the colour intensity of the background of the given colour component.