u add a <b>-yoff</b> option.  These two values were
added in Netpbm 10.10 (October 2002).

<p>The default is <b>top</b>.

<DT><B>-xoff=</B><I>x</I>

<DD>This option modifies the horizontal positioning of the overlay
image with respect to the underlying image as selected by the
<b>-align</b> option.  <b>pamcomp</b> shifts the overlay image from
that basic position <i>x</i> pixels to the right.  <i>x</i> can be
negative to indicate shifting to the left.

<p>The overlay need not fit entirely (or at all) on the