As the appearance of space is essentially important both for task and ambient lighting which can offer energy efficient lighting, and for architectural aesthetic design, a design method utilizing appearance reproduction image, which is named as real appearance image, is proposed. The real appearance image was generated to agree brightness values in two brightness images, one converted from the luminance image in the real environment, and the other converted from the luminance image in observing environment. A practical procedure to generate the approximate real appearance image was then proposed, because the original method contains convergence calculation. The experiment where the appearance of approximate real appearance image on a display was compared with the real scene appearance by 10 subjects, showed that about 70% of the appearance could be reproduced on the display. Finally some examples to make use of this real appearance image, based on 3 dimensional computer simulation, are illustrated.
