Evaluation of the Stability of Light Faded Images of Colour Xerography According to Colour Differences in CIELAB

Abstract

The light fading of four different types of colour xerographic images was tested by exposure to three different light sources. Colour patches of M, C, Y images prepared from a full size copy of the Macbeth Color Checker were used as test pieces. The fading was evaluated according to colour differences (ΔE^*) in L^*a^*b^* colour space. The value of ΔE^* greatly depended upon the kinds of copy and toner. Regarding the character of the fading, discolouration was strong in C image and the discolouration was equal to the fading of the colour in the M images. In the case of the Y image, the fading showed a definite effect.