Practica2Ej2TipoA.c

int main(int argc, char **argv) {

    if (argc != 2) {
        printf("Error: Usage %s image_file_name\n", argv[0]);
        return EXIT_FAILURE;
    }

    //CV_LOAD_IMAGE_COLOR = 1 forces the resultant IplImage to be colour.
    //CV_LOAD_IMAGE_GRAYSCALE = 0 forces a greyscale IplImage.
    //CV_LOAD_IMAGE_UNCHANGED = -1
    IplImage* ImgOrigen = cvLoadImage(argv[1], CV_LOAD_IMAGE_COLOR);
    IplImage* ImgDestino = cvCreateImage(cvSize(ImgOrigen->width, ImgOrigen->height), IPL_DEPTH_8U, 3);
    // Always check if the program can find the image file
    if (!ImgDestino) {
        printf("Error: file %s not found\n", argv[1]);
        return EXIT_FAILURE;
    }

    // a visualization window is created with title: image file name
    cvNamedWindow(argv[1], CV_WINDOW_AUTOSIZE);
    // Img is shown in 'image' window
    cvShowImage(argv[1], ImgOrigen);
    int fila, columna, pasada, cont;
    // nos movemos por filas
    for (pasada = 0; pasada <= 1000; pasada++){
        for (fila = 0; fila < ImgDestino->height; fila++) {
            unsigned char *pLeer = (unsigned char *) ImgOrigen->imageData + fila * ImgOrigen->widthStep;
            unsigned char *pEscribir = (unsigned char *) ImgDestino->imageData + fila * ImgDestino->widthStep;

            for (columna = 0; columna < ImgDestino->width; columna++) {
                if (*pLeer-pasada > 0){
                *pEscribir++ = *pLeer-pasada;
                *pLeer++;
                } else {
                    *pEscribir++;
                    *pLeer++;
                }
                if (*pLeer-pasada > 0){
                *pEscribir++ = *pLeer-pasada;
                pLeer++;
                } else {
                    *pEscribir++;
                    *pLeer++;
                }
                if (*pLeer-pasada > 0){
                *pEscribir++ = *pLeer-pasada;
                pLeer++;
                } else {
                    *pEscribir++;
                    *pLeer++;
                }
            }

        }
        cvShowImage("Imagen Recolor", ImgDestino);
        cvWaitKey(30);
    }

    cvWaitKey(0);


    // memory release for images before exiting the application
    cvReleaseImage(&ImgOrigen);
    cvReleaseImage(&ImgDestino);

    // Self-explanatory
    cvDestroyWindow(argv[1]);
    cvDestroyWindow("Imagen Recolor");

    return EXIT_SUCCESS;
}