snipnet1

[lix19937]

#include <cv.h>
#include <highgui.h>
 
using namespace cv;
using namespace std;
 
#define BLUE 	        0
#define GREEN	1
#define RED 	        2
 
#ifndef SCREEN_XY
#define SCREEN_XY(x, y)  (255 - ((255 - (x))*(255 - (y)) >> 8))
#endif
 
int main(){
	char imgfile[256] = "E:\\t11.jpg";
	Mat src = imread(imgfile, CV_LOAD_IMAGE_COLOR);
	imshow("src", src);
 
	int size = src.cols * src.rows;
	uchar r = 0, g = 0, b = 0, g_alpha = 0;
	uchar *pSrcData = src.data;
	for (int i = 0; i < size; i++, pSrcData += 3)
	{
		g_alpha = 255 - pSrcData[GREEN];
		b = pSrcData[BLUE]*g_alpha  >> 8;
		g = pSrcData[GREEN]*g_alpha >> 8;
		r = pSrcData[RED]*g_alpha   >> 8;
 
		pSrcData[BLUE]  = SCREEN_XY(pSrcData[BLUE],  b);
		pSrcData[GREEN] = SCREEN_XY(pSrcData[GREEN], g);
		pSrcData[RED]   = SCREEN_XY(pSrcData[RED],   r);
	}
 
	imshow("dst", src);
 
	waitKey();
	return 0;
}

[lix19937]

https://blog.csdn.net/grafx/category_1824345.html