==============================================

版權所有：小熊不去實驗室CSDN部落格

==============================================

R(上)>127.5

R=R(下)+(255-R(下))*(R(上)-127.5)/127.5;

R(上)<127.5

R=R(下)-R(下)*(127.5-R(上))/127.5=(R(上)*R(下))/127.5;

#include <math.h>
#include <opencv/cv.h>
#include <opencv/highgui.h>

using namespace cv;
using namespace std;

int R=11;

int main()
{
	Mat src = imread("D:/img/liushishi02.jpg",1);
	imshow("src",src);
	int width=src.cols;
	int heigh=src.rows;
	Mat img;
	src.copyTo(img);

	Mat dst(img.size(),CV_8UC3);
	Mat dst1u[3];


	float tmp,r;
	for (int y=0;y<heigh;y++)
	{
		uchar* imgP=img.ptr<uchar>(y);
		uchar* dstP=dst.ptr<uchar>(y);
		for (int x=0;x<width;x++)
		{
			r = (float)imgP[3*x];
			if(r>127.5)
				tmp = r+(255-r)*(r-127.5)/127.5;
			else
				tmp = r*r/127.5;
			tmp=tmp>255?255:tmp;
			tmp=tmp<0?0:tmp;
			dstP[3*x]=(uchar)(tmp);

			r = (float)imgP[3*x+1];
			if(r>127.5)
				tmp = r+(255-r)*(r-127.5)/127.5;
			else
				tmp = r*r/127.5;
			tmp=tmp>255?255:tmp;
			tmp=tmp<0?0:tmp;
			dstP[3*x+1]=(uchar)(tmp);

			r = (float)imgP[3*x+2];
			if(r>127.5)
				tmp = r+(255-r)*(r-127.5)/127.5;
			else
				tmp = r*r/127.5;
			tmp=tmp>255?255:tmp;
			tmp=tmp<0?0:tmp;
			dstP[3*x+2]=(uchar)(tmp);
		}
	}
	imshow("強光",dst);
	
	split(dst,dst1u);
	imshow("綠通道強光",dst1u[1]);

	waitKey();
	imwrite("D:/img/強光.jpg",dst);
	imwrite("D:/img/強光_藍通道.jpg",dst1u[0]);
	imwrite("D:/img/強光_綠通道.jpg",dst1u[1]);
	imwrite("D:/img/強光_紅通道.jpg",dst1u[2]);

}
 

計算強光：

紅通道：

綠通道：

藍通道：