| 摘要 |
PROBLEM TO BE SOLVED: To suppress chroma from largely lowering before and after the conversion, thereby to avoid a situation where brightness is recognized at a lower degree and also to prevent an image contrast and an S/N ratio from largely degraded.SOLUTION: A color gamut conversion apparatus includes: first focal point setting means (12a) for setting, in a C-Lplane of a CIELAB color space for each hue, an intersection point between a straight line c connecting a maximum chroma point Sh1 in the wide color gamut and a maximum chroma point Sh2 of the narrow color gamut, and an Laxis, as a first focal point L; second focal point setting means (12b) for setting an intersection point between the straight line c and a Caxis as a second focal point C; and color gamut conversion means (13) for performing the color gamut conversion, when defining a straight line d as a line connecting the first focal point Land the second focal point C, a first region 21 as a region above the straight line d and a second region 22 as a region below the straight line d, in such a manner that the color gamut conversion in the first region 21 is performed by moving along the straight line toward the first focal point L, and the color gamut conversion in the second region 22 is performed by moving along the straight line diverging from the second focal point C.SELECTED DRAWING: Figure 3 |
