random_image.cpp

#include <stdlib.h>
#include <time.h>
#include <stdio.h>

#define HEIGHT 640
#define WIDTH 480
#define FIELDS 3

int main(int argc, char** argv) {
    FILE* f_img;

    srand(time(nullptr));
    unsigned char pix[HEIGHT][WIDTH][FIELDS] = {0};
    
    
    for(int i = 0; i < HEIGHT; i++) {
        for(int j = 0; j < WIDTH; j++) {
            for(int h = 0; h < FIELDS; h++)
                pix[i][j][h] = std::rand(); 
        }
    }
    f_img = fopen("random_image.ppm", "wb");
    fprintf(f_img, "P6\n");
    fprintf(f_img, "%d %d\n", WIDTH, HEIGHT);
    fprintf(f_img, "255\n");
    fwrite(pix,1, HEIGHT*WIDTH*FIELDS,f_img);
    fclose(f_img);
    return 0;
}