====== Merge Images ======

===== Side-by-Side (vertical) =====

<code bash>
gm convert ./input/*.jpg -append output.jpg
</code>

===== Side-by-Side (horizontal) =====

<code bash>
gm convert ./input/*.jpg +append output.jpg
</code>

===== Overlay =====

<code bash>
composite -blend 80 -gravity center input1.png input2.jpg output.png
</code>