The human skin tones are important colours in the colour reproduction of digital photographic images. They are memory colours for which people have distinct preference regardless of how they appear in real life. For preferred colour reproduction, the skin tones should be reproduced according to subject's preferences. The skin colour preferences of different ethnic skin tones judged by observer groups with mixed ethnic backgrounds have been studied in the past. However, they did not answer all questions about skin colour preferences of individual-culture backgrounds and skin colour preferences of cross-culture backgrounds. This study is to investigate the skin colour preference of individual-ethnic backgrounds and the skin colour preference of cross-culture backgrounds. The result is to be used for optimising skin colour reproduction of colour imaging products for different geographical regions