diff --git a/px6_convert.sh b/px6_convert.sh
index 8a914ea..a49e6d4 100755
--- a/px6_convert.sh
+++ b/px6_convert.sh
@@ -1,4 +1,5 @@
-#! /bin/bash
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p bash imagemagick
 
 INPUT="$1"
 OUTPUT="$2"
@@ -10,18 +11,19 @@ if [ "$OH" == "" ]; then OH=0; fi
 OPTIONS="-resize $W -set depth 8 -set colorspace RGB"
 
 #initial conversion
-convert-im6 $OPTIONS "$INPUT" txt:- | awk -v ow="$OW" -v oh="$OH" 'match($0, /^([0-9]*),([0-9]*):.*#([0-9A-Fa-f]{6,8}) +r/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " arr[3] }' > "$OUTPUT"
+convert $OPTIONS "$INPUT" txt:- | awk -v ow="$OW" -v oh="$OH" 'match($0, /^([0-9]*),([0-9]*):.*#([0-9A-Fa-f]{6,8}) +r/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " arr[3] }' > "${OUTPUT}.tmp"
 
 echo optimizing >&2
 
 # edge detection
-convert-im6 $OPTIONS "$INPUT" -negate -edge 4 -negate txt:- | awk -v ow="$OW" -v oh="$OH" 'match($0, /^([0-9]*),([0-9]*):.*#000000/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " }' > /tmp/px6_optimize
-grep -Ff /tmp/px6_optimize "$OUTPUT" >  "${OUTPUT}.tmp"
-grep -Ff /tmp/px6_optimize "$OUTPUT" >> "${OUTPUT}.tmp"
-grep -Ff /tmp/px6_optimize "$OUTPUT" >> "${OUTPUT}.tmp"
-grep -Ff /tmp/px6_optimize "$OUTPUT" >> "${OUTPUT}.tmp"
-cat "${OUTPUT}.tmp" >> "$OUTPUT"
-cat "$OUTPUT" | grep -ve " [a-fA-F0-9]\{6\}00" | shuf > "${OUTPUT}.tmp"
-mv "${OUTPUT}.tmp" "$OUTPUT"
-rm /tmp/px6_optimize
+convert $OPTIONS "$INPUT" -canny 0x1+10%+30% txt:- | awk -v ow="$OW" -v oh="$OH" 'match($0, /^([0-9]*),([0-9]*):.*#000000/, arr ){ print "PX " arr[1]+ow " " arr[2]+oh " " }' > /tmp/px6_optimize
 
+grep -Ff /tmp/px6_optimize "${OUTPUT}.tmp" >> "${OUTPUT}.tmp2"
+cat "${OUTPUT}.tmp" > "${OUTPUT}.tmp3"
+cat "${OUTPUT}.tmp2" >> "${OUTPUT}.tmp3"
+cat "${OUTPUT}.tmp2" >> "${OUTPUT}.tmp3"
+cat "${OUTPUT}.tmp2" >> "${OUTPUT}.tmp3"
+cat "${OUTPUT}.tmp2" >> "${OUTPUT}.tmp3"
+cat "${OUTPUT}.tmp3" | grep -ve " [a-fA-F0-9]\{6\}00" | shuf > /tmp/px6_optimize
+mv /tmp/px6_optimize "$OUTPUT"
+rm "${OUTPUT}.tmp" "${OUTPUT}.tmp2" "${OUTPUT}.tmp3"
diff --git a/px6_send.sh b/px6_send.sh
index eee52cc..086e13a 100755
--- a/px6_send.sh
+++ b/px6_send.sh
@@ -1,4 +1,5 @@
-#! /bin/bash	
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p bash bc
 IP="$1"
 PORT="$2"
 PROCS="$3"
@@ -13,7 +14,7 @@ do_exit() {
 }
 trap do_exit SIGINT SIGTERM
 
-for i in $(seq 0 $(($PROCS-1))); do
+for i in $(seq 1 $PROCS); do
 	(
 		THISPID=$BASHPID
 		# ( while kill -0 $MAINPID; do sleep 1; done; do_exit ) &
@@ -21,11 +22,11 @@ for i in $(seq 0 $(($PROCS-1))); do
 			(
 				THISPID2=$BASHPID
 				( sleep $PROCMAXTIME; kill -9 $THISPID2 >/dev/null 2>&1 ) &
-				echo "starting $(($i+1)) / $PROCS"
-				( while kill -0 $THISPID2; do cat "$FILE"; done ) | nc "$IP" "$PORT" >/dev/null 2>&1
+				echo "starting $i / $PROCS"
+				( while kill -0 $THISPID2; do cat "$FILE"; done ) > /dev/tcp/$IP/$PORT 2>&1
 			) >/dev/null 2>&1
 		done
 	) &
-	sleep $(echo "scale=2; ($PROCMAXTIME/$PROCS) + 1" | bc)
+	# sleep $(echo "scale=2; ($PROCMAXTIME/$PROCS) + 1" | bc)
 done
 while true; do sleep 9999999; done