1. A method for adjusting the color of images, applied to a color display having a color gamut, the method comprising: obtaining an original hue-saturation-value (HSV) color coordinate from an original image signal; converting the original HSV color coordinate into an adjusted HSV color coordinate according to a color adjusting data; converting the adjusted HSV color coordinate into a corrected HSV color coordinate; and generating an output image signal according to the corrected HSV color coordinate; wherein the color adjusting data comprises a hue weight value, a saturation weight value, and a brightness weight value, the original HSV color coordinate comprises an original hue value, an original saturation value, and an original brightness value, the adjusted HSV color coordinate comprises an adjusted hue value, an adjusted saturation value, and an adjusted brightness value, and the color adjusting data, the original HSV color coordinate and the adjusted HSV color coordinate satisfy equations as follows: 
 H′=H+Wh; 
 S′=S×Ws ; and 
 V′=V×Wv, wherein H is the original hue value, S is the original saturation value, and V is the original brightness value; H′ is the adjusted hue value, S′ is the adjusted saturation value, and V′ is the adjusted brightness value; and Wh is the hue weight value, Ws is the saturation weight value, and Wv is the brightness weight value; and wherein the corrected HSV color coordinate comprises a corrected hue value, a corrected saturation value, and a corrected brightness value, and the adjusted HSV color coordinate and the corrected HSV color coordinate satisfy equations as follows: 
 H ″=(1 −Sm )× H+Sm×H′; 
 S ″=(1 −Sm )× S+Sm×S ′; and 
 V ″=(1 −Sm )× V+Sm×V′, wherein H″ is the corrected hue value, S″ is the corrected saturation value, and V″ is the corrected brightness value; and Sm is a saturation parameter.