Template code image

#define _CRT_SECURE_NO_WARNINGS 1
#include <vector>

#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"

#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"



int main() {
    int W = 512;
    int H = 512;

    std::vector<unsigned char> image(W*H * 3, 0);
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {

            image[(i*W + j) * 3 + 0] = 255;
            image[(i*W + j) * 3 + 1] = 0;
            image[(i*W + j) * 3 + 2] = 0;
        }
    }
    stbi_write_png("image.png", W, H, 3, &image[0], 0);

    return 0;
}