| Vec3Real64 Impala::Core::Array::Element::ColRGB2HSI | ( | const Vec3Real64 & | v | ) | [inline] |
Conversion from RGB to HSI.
No formula yet...
Definition at line 251 of file ColConvert.h.
References E1Min(), E1Sum(), TWO_PI, Impala::Core::Array::Element::Vec3Real64::X(), Impala::Core::Array::Element::Vec3Real64::Y(), and Impala::Core::Array::Element::Vec3Real64::Z().
Referenced by Impala::Core::Array::Element::Color::ToHSI().
00252 { 00253 double I = E1Sum(v) / 3.0; 00254 double S = (I == 0.0) ? 1.0 : 1.0 - (E1Min(v) / I); 00255 double H; 00256 if (v.X() == v.Y() && v.Y() == v.Z()) 00257 H = 0.0; 00258 else { 00259 double tmp = acos((0.5*(v.X()-v.Y()+v.X()-v.Z())) / 00260 sqrt((v.X()-v.Y())*(v.X()-v.Y())+(v.X()-v.Z())*(v.Y()-v.Z()))); 00261 H = (v.Y() > v.Z()) ? tmp : TWO_PI - tmp; 00262 } 00263 return Vec3Real64(H, S, I); 00264 }
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