melt photos/.all.jpg ttl=100 \
-filter watermark:colour:black reverse=1 composite.geometry="0=15%/15%:10%/10%; 0.1625=0/0:100%x100%; -.1625=; -1=70%/70%:10%x10%" composite.mirror_off=1 composite.cycle=100 composite.fill=1 composite.valign=c composite.halign=c \
$*
