convert_rgb_to_web_safe_color.c

#include <iostream>
#include <opencv2/opencv.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;

int convertToWebSafe(int color) {
	//0   51    102   153   204   255
	//  25   76    127   178   229
	if (color >= 229)
		return 255;
	else if (color >= 178)
		return 204;
	else if (color >= 127)
		return 153;
	else if (color >= 76)
		return 102;
	else if (color >= 25)
		return 51;
	else
		return 0;
}

int main()
{	
	Mat3b  image= imread("C:/img/Fig0608(RGB-full-color-cube).tif");//image
	Mat3b  srcImage = imread("C:/img/Fig0608(RGB-full-color-cube).tif");//src image

	int i, j;
	int r, g, b;
	printf("%d,%d",image.size().width, image.size().height);	
	for (i = 0; i < image.size().width;i++) { //access each pixel
		for (j = 0; j < image.size().height;j++) {
			b = image.at<cv::Vec3b>(j, i)[0]; //b
			g = image.at<cv::Vec3b>(j, i)[1]; //g
			r = image.at<cv::Vec3b>(j, i)[2]; //r

			//
			image.at<cv::Vec3b>(j, i)[0] = convertToWebSafe(b);
			image.at<cv::Vec3b>(j, i)[1] = convertToWebSafe(g);
			image.at<cv::Vec3b>(j, i)[2] = convertToWebSafe(r);
			//printf("%d", image.at<cv::Vec3b>(j, i)[0]);
		}
	}

	imshow("web safe", image);
	imshow("src", srcImage);
	waitKey(0);
	return 0;
}