Process to indicate coloured image under different lighting conditions

摘要

The process involves determining a shift relationship of the visual white of the indicating system, using a colour type and a light density ratio. A new visual white of the indicating system is obtained, in which the influence of the light source is eliminated, using the shift relationship. A white of the indicated coloured image on the indicating system, is shifted to the new visual white. The light density ratio is obtained by the brightness ratio of a white paper on the indicating system in relation to the brightness of the indicating system.