Abstract: A method for analysing a thermal paint includes the step of defining a color space in at least two dimensions, the dimensions representing different colors and/or luminance values. The location of reference points, representing calibration data, is defined within the color space for comparison with color information relating to a part to be analysed. Each pixel of an image of the part to be analysed is given a location in color space and the nearest calibration reference point is determined. In this way, the approximate temperature of that point can be established.