Fly needs the</span>
0023 <span class="comment">%                   fly to be a bright spot, so the choice of this depends on</span>
0024 <span class="comment">%                   the origional image.  If the original image is RGB, chances</span>
0025 <span class="comment">%                   are that 'neg' needs to be selected.</span>
0026 <span class="comment">%      sqrsize:     This is half the length of the sides of the square</span>
0027 <span class="comment">%                   around the brightest s