To easily change the hue of a picture obtained by three-dimensional computer graphics without operating any complicate optical calculation by operating the picture processing of a highly precise computer graphics picture obtained by operating lettering based on a colormetrology by using simple picture processing software.
A lettering picture is formed on a three-dimensional curved face by three-dimensional computer graphics software by using reflectivity data for each combination with a changed gate angle for the plural colormetric wavelength of a visible light area. Hue correction is operated by allowing simple picture processing software to read the three-dimensional computer graphics picture. Hue setting is operated on the simple picture processing software, and a picture whose hue is changed is prepared. The corrected picture obtained in this way is preserved and/or displayed on a CRT display device. Also, this corrected picture can be outputted to a printer.
ASABA HISAO
KUWANO KOICHI
