| 摘要 |
<p>Three primary color signals R, G and B supplied to input terminals (151R, 151G, 151B) are multiplied by a factor (k) for luminance compression by multipliers (156R, 156G, 156B) while the saturations and hues are maintained, and three primary color signals R', G' and B' are outputted from the multipliers (156R, 156G, 156B). Only the saturations of the color image signals comprising the three primary color signals R', G' and B' are compressed by first saturation compressing circuits (160R, 160G, 160B) so that the highest signal level among the levels of the three primary color signals R', G' and B' may be a clip level while the hues and luminances of the color image signals are maintained. Then only the saturations of three primary color signals R', G' and B' which are produced by the first saturation compressing circuits (160R, 160G, 160B) are compressed by second saturation compressing circuits (163R, 163G, 163B) while the luminances and hues of the three primary color signals R', G' and B' are maintained to generate three primary color signals R*, G* and B* whose saturations of the high luminance parts only are changed.</p> |
