I12Answer

/* Make all pixels of an image the same value */
void clearImage( image img, const unsigned char val)
{
  int r, c;

  for ( r = 0; r<img.nrows; r++ )
    for ( c = 0; c<img.ncols; c++ )
      setPixel( img, r, c, val );
}

Comments: This is nearly the same as the answer to I11. It should be easy to modify it so that it uses the above function.