diff --git a/tools/mkloop.sh b/tools/mkloop.sh
index 8e504dc..b0a0d02 100755
--- a/tools/mkloop.sh
+++ b/tools/mkloop.sh
@@ -22,8 +22,9 @@ POVOPT="+q9 +A0.02 -d ${DIMS} ${NBFR} -WT7"
 echo $POVOPT ; echo ; sleep 2
 
 TMPIMG=/dev/shm/${SEQNAME}-tmp.png
-echo "TMPIMG" ${TMPIMG} | tee -a WS/log                          # DEBUG !
-for frame in $(seq $START $((NBFRAMES-1)))
+echo "TMPIMG" ${TMPIMG} | tee -a WS/log                 # DEBUG !
+INC=1
+for frame in $(seq $START $INC $((NBFRAMES-1)))
 do
 
 	img=$(printf "frames/%s/%05d.png" $SEQNAME $frame)