        case 11: /* perform image addition and subtraction */
           printf("\nCIPS> Image Addition:"
                "\n         output = first + second"
                "\n      Image Subtractions:"
                "\n         output = first - second");
           printf("\nCIPS> Enter first image name\n");
           get_image_name(name);
           printf("\nCIPS> Enter second image name\n");
           get_image_name(name2);
           printf("\nCIPS> Enter output image name\n");
           get_image_name(name3);
           printf("\nCIPS> Enter parameters for first image");
           get_parameters(&il, &ie, &ll, &le);
           printf("\nCIPS> Enter parameters for second image");
           get_parameters(&il2, &ie2, &ll2, &le2);
           printf("\nCIPS> Enter parameters for output image");
           get_parameters(&il3, &ie3, &ll3, &le3);
           printf("\n\nCIPS> Enter a=addition    s=subtraction\n");
           printf("\nCIPS> _\b");
           read_string(low_high);
           if(low_high[0] == 'a' || low_high[0] == 'A')
              add_image_array(name, name2, name3,
                  the_image, out_image,
                  il, ie, ll, le,
                  il2, ie2, ll2, le2,
                  il3, ie3, ll3, le3);
           if(low_high[0] == 's' || low_high[0] == 'S')
              subtract_image_array(name, name2, name3,
                  the_image, out_image,
                  il, ie, ll, le,
                  il2, ie2, ll2, le2,
                  il3, ie3, ll3, le3);
        break;

        case 12: /* image cutting and pasting */
           printf("\n\nCIPS> Cut from source image and paste to"
                  " destination image");
           printf("\nCIPS> Enter source image name");
           get_image_name(name);
           get_parameters(&il, &ie, &ll, &le);
           check_cut_and_paste_limits(&il, &ie, &ll, &le);
           cut_image_piece(name, the_image,
                           il, ie, ll, le);
           printf("\nCIPS> Enter destination image name");
           get_image_name(name2);
           printf("\nCIPS> Enter destination image parameters");
           get_parameters(&il, &ie, &ll, &le);
           check_cut_and_paste_limits(&il, &ie, &ll, &le);
           paste_image_piece(name2, name, the_image,
                             out_image, il, ie, ll, le);
        break;

        case 13: /* image rotation and flipping */
           printf("\nCIPS> Enter source image name");
           get_image_name(name);
           get_parameters(&il, &ie, &ll, &le);
           printf("\nCIPS> Enter destination image name");
           printf("\nCIPS> (source can equal destination)");
           get_image_name(name2);
           printf("\nCIPS> Enter destination image parameters");
           get_parameters(&il2, &ie2, &ll2, &le2);
           printf("\nCIPS> Enter number of Rotations (1, 2, 3)");
           printf("\nCIPS> or type of Flip (4=horizontal 5=vertical)");
           printf("\nCIPS> __\b");
           get_integer(&rotation_type);
           rotate_flip_image_array(name, name2, the_image,
                               out_image, il, ie, ll, le,
                               il2, ie2, ll2, le2,
                               rotation_type);
        break;

        case 14: /* image scaling */
           printf("\nCIPS> Enter input image name");
           get_image_name(name);
           get_parameters(&il, &ie, &ll, &le);
           printf("\nCIPS> Enter output image name");
           get_image_name(name2);
           get_scaling_options(zoom_shrink, &scale, method);
           if(zoom_shrink[0] == 'z' || zoom_shrink[0] == 'Z')
              zoom_image_array(name, name2, the_image, out_image,
                               il, ie, ll, le, scale, method);
           if(zoom_shrink[0] == 's' || zoom_shrink[0] == 'S'){
               printf("\nCIPS> Enter output image parameters");
                 get_parameters(&il2, &ie2, &ll2, &le2);
               shrink_image_array(name, name2, the_image, out_image,
                                  il, ie, ll, le, il2, ie2, ll2, le2,
                                  scale, method);
           }
        break;

        case 15: /* create image */
           printf("\nCIPS> Enter input name of image to create");
           get_image_name(name);
           printf("\nCIPS> Enter number of %d blocks wide",COLS);
           printf("\n      ___\b\b");
           get_integer(&width);
           printf("\nCIPS> Enter number of %d blocks tall",ROWS);
           printf("\n      ___\b\b");
           get_integer(&length);
           image_header.lsb            = 1;
           image_header.bits_per_pixel = 8;
           image_header.image_length   = length*COLS;
           image_header.image_width    = width*ROWS;
           image_header.strip_offset   = 1000;
           for(i=0; i<ROWS; i++)
              for(j=0; j<COLS; j++)
                 the_image[i][j] = 0;
           create_allocate_tiff_file(name,&image_header,the_image);
        break;

        case 20:  /* exit system */
         not_finished = 0;
        break;

        default:
         printf("\nCould not understand response, try again");
        break;


/*--------------------------------------------------------------
  --------------------------------------------------------------*/



   /******************************************************
   *
   *   show_menu(..
   *
   *   This function displays the CIPS main menu.
   *
   *******************************************************/
show_menu()
{

        printf("\n\nWelcome to CIPS");
        printf("\nThe C Image Processing System");
        printf("\nThese are you choices:");
        printf("\n\t1.  Display image header");
        printf("\n\t2.  Show image numbers");
        printf("\n\t3.  Print image numbers");
        printf("\n\t4.  Display image (VGA & EGA only)");
        printf("\n\t5.  Display or print image using halftoning");
        printf("\n\t6.  Print graphics image using dithering");
        printf("\n\t7.  Print or display histogram numbers");
        printf("\n\t8.  Perform edge detection");
        printf("\n\t9.  Perform edge enhancement");
        printf("\n\t10. Perform image filtering");
        printf("\n\t11. Perform image addition and subtraction");
        printf("\n\t12. Perform image cutting and pasting");
        printf("\n\t13. Perform image rotation and flipping");
        printf("\n\t14. Perform image scaling");
        printf("\n\t15. Create a blank image");
        printf("\n\t20. Exit system");
        printf("\n\nEnter choice _\b");

}    /* ends show_menu */
