Abstract: Space correction processing is performed for correcting an error between the position of actual space and the position of space which has been detected by a position sensor and can serve as a virtual space. Processing for setting the position of a screen is performed for accurately ascertaining the three-dimensional position of an image which is displayed on a screen. Processing for setting the position of a visual point is performed for setting the position of an actual visual point of an operator. Consequently, the position of the visual point and a position on the screen can be inputted accurately, and a highly accurate stereoscopic image is displayed in the virtual stereoscopic space faithfully to a real object by adopting the set screen position and the position of the visual point in the virtual space subjected to spatial correction.

Abstract: The present invention provides color reproduction method to reproduce arbitrary colors at high precision simply without requiring a number of preparatory steps. As a means for conversion between CMYK signal value and arbitrary chromaticity, a color material transfer amount which is a physical amount is handled as intermediate amount. A single color characteristic indicating a relation between the signal value and the color material transfer amount and a color mixing characteristic indicating a relation between each color material transfer amount (ink amount) of a plurality of inks and the chromaticity are obtained. By synthesizing the obtained single color characteristic and color mixing characteristic, the signal value/chromaticity characteristic is obtained in the form of a color conversion table.