zoom.c

// gcc -std=c99 `pkg-config --libs --cflags opencv` -o zoom zoom.c

#include <cv.h>     

#include <highgui.h>

#define ZOOM 20

int main(void)

{

    IplImage* img = cvLoadImage("original.png", 1);

    IplImage* zoom_img = cvCreateImage(cvSize(ZOOM * img->width, ZOOM * img->height), img->depth, img->nChannels);

    cvResize(img, zoom_img, CV_INTER_NN);

    cvSaveImage("so_wird_es.png", zoom_img, 0);

    cvReleaseImage(&img);

    cvReleaseImage(&zoom_img);

    return 0;

}