Colour values for the co group increased or decreased sharply for all analytical methods,and for the cont group they changed slowly. In the results of the image analysis,the g and cielab values showed a high correlation coefficient with sensory test results(over 0.9). Cielab values using a colorimeter also showed high correlation coefficients but were comparatively lower than those were of image analysis (except cie a values). Image analysis can be used to obtain the colour information of the entire surface of samples. Furthermore ,it is possible to express various colour values and minimise errors by manual inspection. Further study is needed to identify the changes in colour value in accordance with the degree of brightness.