 underlying image.
<B>pamcomp</B> uses only the parts that lie over the underlying image.

<P>Before Netpbm 10.10 (October 2002), <b>-xoff</b> was mutually 
exclusive with <b>-align</b> and always measured from the left edge.

<DT><B>-yoff=</B><I>y</I>

<DD>This option modifies the vertical positioning of the overlay
image with respect to the underlying image as selected by the
<b>-valign</b> option.  <b>pamcomp</b> shifts the overlay image from
that basic position <i>y</i> pixels downward.  <i>y</i> can be