18 rgb(
unsigned char _r,
unsigned char _g,
unsigned char _b)
25 inline rgb operator-(
const rgb& _p)
const {
return rgb(r - _p.r, g - _p.g, b - _p.b); }
27 inline rgb operator+(
const rgb& _p)
const {
return rgb(r + _p.r, g + _p.g, b + _p.b); }