Revision history [back]

gimp is open source,and i get some color from it before

.... //enhance the color

    Mat Img_out(temp.size(), CV_32FC3);  
    temp.convertTo(Img_out, CV_32FC3);  
    Mat Img_in(temp.size(), CV_32FC3);  
    temp.convertTo(Img_in, CV_32FC3);  
    // define the iterator of the input image  
    MatIterator_<Vec3f> inp_begin, inp_end;  
    inp_begin=Img_in.begin<Vec3f>();  
    inp_end =Img_in.end<Vec3f>();  
    // define the iterator of the output image  
    MatIterator_<Vec3f> out_begin, out_end;  
    out_begin=Img_out.begin<Vec3f>();  
    out_end =Img_out.end<Vec3f>();  
    // increment (-100.0, 100.0)  
    float Increment=50.0/100.0;   //saturation adjust
    float delta=0;  
    float minVal, maxVal;  
    float t1, t2, t3;  
    float L,S;  
    float alpha;  
    for(; inp_begin!=inp_end; inp_begin++, out_begin++)  
    {  
        t1=(*inp_begin)[0];  
        t2=(*inp_begin)[1];  
        t3=(*inp_begin)[2];  
        minVal=std::min(std::min(t1,t2),t3);  
        maxVal=std::max(std::max(t1,t2),t3);  
        delta=(maxVal-minVal)/255.0;  
        L=0.5*(maxVal+minVal)/255.0;  
        S=std::max(0.5*delta/L, 0.5*delta/(1-L));  
        if (Increment>0)  
        {  
            alpha=max(S, 1-Increment);  
            alpha=1.0/alpha-1;  
            (*out_begin)[0]=(*inp_begin)[0]+((*inp_begin)[0]-L*255.0)*alpha;  
            (*out_begin)[1]=(*inp_begin)[1]+((*inp_begin)[1]-L*255.0)*alpha;  
            (*out_begin)[2]=(*inp_begin)[2]+((*inp_begin)[2]-L*255.0)*alpha;  
        }  
        else  
        {  
            alpha=Increment;  
            (*out_begin)[0]=L*255.0+((*inp_begin)[0]-L*255.0)*(1+alpha);  
            (*out_begin)[1]=L*255.0+((*inp_begin)[1]-L*255.0)*(1+alpha);  
            (*out_begin)[2]=L*255.0+((*inp_begin)[2]-L*255.0)*(1+alpha);  
        }  
    }  
    Img_out /=255;
    Img_out.convertTo(matDst,CV_8UC3,255);

the reuslt is sth like this:

may it help you.