Patent ID: 7339619

Claim:
An image pickup system for tone converting and outputting a color signal of a primary color or a color signal of a complementary color from an image pickup apparatus, the system comprising: color space converting means for converting the color signal to signals in a color space having three signals including a luminance signal, a hue signal and a chroma signal; tone converting means for performing tone conversion on the luminance signal; correction coefficient calculating means for calculating a chroma correction coefficient to be used for performing correction on the chroma signal; maximum chroma calculating means for calculating a first maximum chroma value in the color space with respect to the luminance signal from the color space converting means and the hue signal from the color space converting means and a second maximum chroma value in the color space with respect to the luminance signal converted by the tone converting means and the hue signal from the color space converting means; and chroma correcting means for performing correction on the chroma signal based on the first maximum chroma value, the second maximum chroma value and the chroma correction coefficient.