ken: keeps the darker value of overlapping pixels.</p>

<p> 7 Lighten: keeps the lighter value of overlapping pixels.</p>

<p> 8 Color_Dodge: brightens pixels being drawn over.</p>

<p> 9 Color_Burn: darkens pixels being drawn over.</p>

<p> 10 Hard_Light: multiplies colors if source pixel level is >= 8, screens colors if source pixel level is &lt; 8.</p>

<p> 11 Soft_Light: uses Darken or Lighten depending on the color of the source pixel.</p>

<p> 12 Difference: the result is the absolute value of the dif