COLOR SIGNAL CONVERTING APPARATUS, VIDEO DISPLAYING APPARATUS, COLOR SIGNAL CONVERTING METHOD, VIDEO DISPLAYING METHOD AND IMAGE DATA

摘要

Provided is a color signal converting apparatus that supports DCI color gamuts and has substantial downward compatibilities with BT.709 and xvYCC.  The color signal converting apparatus comprises a first color gamut converting unit (102) and a first color converting unit (103) that convert first color signals to second color signals which are expressed by a second color gamut, said second color gamut being wider than a given color gamut defined by primary color points of a given standard and having the primary color points of the given standard; a gamma converting unit (104) that converts the second color signals in accordance with gamma characteristics; a brightness/color difference conversion unit (105) that converts the second color signals to brightness signals and color difference signals; a color gamut compressing unit (106) that converts, based on a conversion factor, the color difference signals in such a manner that those color difference signals which fall within a range of numerical values that can be exhibited by color difference signals, yet which are outside the range expressed by the second color gamut, become color difference signals having a color gamut wider than the given color gamut and narrower than the second color gamut; and an output unit (108) that provides, as output signals, the color difference signals as converted and the brightness signals.