Patent ID: 8203751

Claim:
A color signal converting apparatus comprising: a color signal receiving unit that receives input of first color signals; and a converting unit that performs a conversion of the first color signals received by the color signal receiving unit, into second color signals, the converting unit performing the conversion to make a total sum of color component values of each of the second color signals equal to or smaller than an upper limit value set for each of the second color signals, wherein the converting unit comprises: a first color space converting part that converts the first color signals in a first color space, into color signals in a second color space; a total sum upper limit setting part that sets the upper limit value for the total sum of the color component values of each of the second color signals for which the conversion is performed; a color gamut compressing part that performs color gamut compression processing to move the color signals in the second color space converted by the first color space converting part, to inside of a color region composed of a group of color coordinates that allows the total sum of the color component values in the first color space after the conversion by the converting unit to be equal to or smaller than the upper limit value set by the total sum upper limit setting part; and a second color space converting part that converts the color signals for which the color gamut compression processing is performed by the color gamut compressing part, into the second color signals in the first color space, and wherein the converting unit calculates the total sum of color component values of a color signal that has the smallest total sum of the color component values among color signals in the first color space after the conversion, when the color signals in the second color space converted by the first color space converting part are converted into the second color signals in the first color space, and the converting unit performs the color gamut compression processing by use of the color gamut compressing part, when the smallest total sum is greater than the upper limit value set by the total sum upper limit setting part.