diff --git a/fourcell.sh b/fourcell.sh
index fc65b64..8de3bc0 100644
--- a/fourcell.sh
+++ b/fourcell.sh
@@ -44,20 +44,36 @@ img_name () {
 
 echo "Using frames in ${OUTPUT}..."
 
+DIGITS=6
+SCALE=$(echo "scale=$DIGITS; 323/404" | bc)
+OUTER=$(echo "scale=$DIGITS; 374/404" | bc)
+
 W=$(cat "${1}" | jq -r ".width")
 H=$(cat "${1}" | jq -r ".height")
 DPI=$(echo "${W}/8.5" | bc)
 FRAMES=$(mktemp)
 RATIO=$(bash fourcell/template_ratio.sh "${1}")
+TMP=$(mktemp -d)
 
-echo "DPI: $DPI"
+echo "DPI: ${DPI}"
 
-ls -1 "${OUTPUT}"*.{jpg,jpeg,JPG,JPG,png,PNG,gif,GIF,tif,tiff,TIF,TIFF} > "${FRAMES}" 2> /dev/null
+ONEFRAME=$(ls -1 "${OUTPUT}"*.{jpg,jpeg,JPG,JPG,png,PNG,gif,GIF,tif,tiff,TIF,TIFF} 2> /dev/null | head -n1)
+DIM=$(identify -ping -format '%w %h' "${ONEFRAME}")
+WIDTH=$(echo ${DIM} | awk '{print $1}')
+HEIGHT=$(echo ${DIM} | awk '{print $2}')
+R=$(echo "scale=${DIGITS};${HEIGHT}/${WIDTH}" | bc)
+OW=$(echo "scale=${DIGITS};${DPI}*(404/96)" | bc | awk -F'.' '{print $1}')
+IW=$(echo "scale=${DIGITS};${OW}*${SCALE}" | bc | awk -F'.' '{print $1}')
+IH=$(echo "scale=${DIGITS};${IW}*${R}" | bc | awk -F'.' '{print $1}')
+
+GUIDE="${TMP}/guide_$(date +%s).png"
+bash fourcell_guide.sh --dpi ${DPI} --dimensions "${IW}x${IH}" "${GUIDE}"
+echo "${GUIDE}" > "${FRAMES}"
+
+ls -1 "${OUTPUT}"*.{jpg,jpeg,JPG,JPG,png,PNG,gif,GIF,tif,tiff,TIF,TIFF} >> "${FRAMES}" 2> /dev/null
 FC=$(wc -l < "${FRAMES}")
 PAGES=$(echo "(${FC}/4)+1" | bc)
 
-TMP=$(mktemp -d)
-
 for ((i=0;i<${PAGES};++i)); do
 	f1=$(sed -n "$(((i*4)+1))p" < "${FRAMES}")
 	f2=$(sed -n "$(((i*4)+2))p" < "${FRAMES}")
diff --git a/fourcell/guide.py b/fourcell/guide.py
new file mode 100644
index 0000000..82f7402
--- /dev/null
+++ b/fourcell/guide.py
@@ -0,0 +1,73 @@
+import argparse
+import cv2
+import numpy as np
+
+IN=25.4
+DPI=600
+MINLINE=150
+
+def create_blank(width, height):
+	rgb_color=(255,255,255)
+	image = np.zeros((height, width, 3), np.uint8)
+	color = tuple(reversed(rgb_color))
+	image[:] = color
+	return image
+
+def guide (args) :
+
+	if 'dpi' in args :
+		DPI = args.dpi
+
+	line = round(DPI/MINLINE)
+	halfLine = round(line/2)
+	if line == 1 :
+		halfLine = 1
+	dims = args.dimensions.split('x')
+	w = int(dims[0])
+	h = int(dims[1])
+
+	halfW = round(w/2)
+	halfH = round(h/2)
+
+	tenthW = round(w/10)
+	tenthH = round(h/10)
+
+	img = create_blank(w, h)
+
+	print(line)
+	print(w)
+	print(h)
+
+	# bisect
+	cv2.line(img, (halfW, 0,), (halfW, h,), [0, 0, 0], line) 
+	cv2.line(img, (0, halfH,), (w, halfH,), [0, 0, 0], line)
+
+	# outline
+	cv2.line(img, (halfLine, 0,), (halfLine, h,), [0, 0, 0], line)
+	cv2.line(img, (w-halfLine, 0,), (w-halfLine, h,), [0, 0, 0], line)
+
+	cv2.line(img, (0, halfLine,), (w, halfLine,), [0, 0, 0], line) 
+	cv2.line(img, (0, h-halfLine,), (w, h-halfLine,), [0, 0, 0], line) 
+
+	# ticks
+	for i in range(0, 9) :
+		y1 = round(halfH + ((i + 1) * (tenthH/2)))
+		y2 = round(halfH - ((i + 1) * (tenthH/2)))
+		cv2.line(img, (halfW - round(tenthW/4), y1,), (halfW + round(tenthW/4), y1,), [0, 0, 0], line)
+		cv2.line(img, (halfW - round(tenthW/4), y2,), (halfW + round(tenthW/4), y2,), [0, 0, 0], line)
+		x1 = round(halfW + ((i + 1) * (tenthW/2)))
+		x2 = round(halfW - ((i + 1) * (tenthW/2)))
+		cv2.line(img, (x1, halfH - round(tenthH/4),), (x1, halfH + round(tenthH/4),), [0, 0, 0], line)
+		cv2.line(img, (x2, halfH - round(tenthH/4),), (x2, halfH + round(tenthH/4),), [0, 0, 0], line)
+
+	cv2.imwrite(args.output, img)
+
+def main () :
+	parser = argparse.ArgumentParser()
+	parser.add_argument('output',  help='Output file')
+	parser.add_argument('--dpi', '-d', help='DPI', required=False, type=int, default=600)
+	parser.add_argument('--dimensions', '-D', help='Dimensions of image', required=True, type=str)
+	args = parser.parse_args()
+	guide(args)
+
+main()
\ No newline at end of file
diff --git a/fourcell/white_fourcell.sh b/fourcell/white_fourcell.sh
index 3ab95f0..db13f5e 100644
--- a/fourcell/white_fourcell.sh
+++ b/fourcell/white_fourcell.sh
@@ -1,20 +1,23 @@
 #!/bin/bash
 
+#######
+#
+# Centers a frame of video in a white image container.
+#
+######
+
 source ./common.sh
 
-#iWidth  323 = oWidth  404
-#iHeight 242 = oHeight 374
+# iWidth  323 = oWidth  404
+# iHeight 242 = oHeight 374
+# current ratio 1.088
+# template ratio 1.291
 
 DIGITS=6
 SCALE=$(echo "scale=$DIGITS; 323/404" | bc)
 OUTER=$(echo "scale=$DIGITS; 374/404" | bc)
 RATIO=$(echo "scale=$DIGITS; 242/323" | bc)
 
-# current ratio 1.088
-# template ratio 1.291
-
-
-
 if [[ "${1}" != "" ]]; then
 	DPI=${1}
 else
@@ -42,6 +45,7 @@ fi
 DIM=$(identify -ping -format '%w %h' "${3}")
 WIDTH=$(echo ${DIM} | awk '{print $1}')
 HEIGHT=$(echo ${DIM} | awk '{print $2}')
+
 R=$(echo "scale=${DIGITS};${HEIGHT}/${WIDTH}" | bc)
 OW=$(echo "scale=${DIGITS};${DPI}*(404/96)" | bc | awk -F'.' '{print $1}')
 OH=$(echo "scale=${DIGITS};${OW}*${OUTER}" | bc | awk -F'.' '{print $1}')
@@ -54,4 +58,5 @@ convert "${3}" -resize ${IW}x${IH}  "${TMP}/resize.tif"
 composite -gravity Center -colorspace sRGB  "${TMP}/resize.tif" "${TMP}/white.tif" "${4}"
 rm -rf "${TMP}"
 
-echo "Centered in white ${3} -> ${4}"
\ No newline at end of file
+echo "Centered in white ${3} -> ${4}"
+
diff --git a/fourcell_guide.sh b/fourcell_guide.sh
new file mode 100644
index 0000000..8e2b476
--- /dev/null
+++ b/fourcell_guide.sh
@@ -0,0 +1,8 @@
+#!/bin/bash
+
+cd fourcell
+source env/bin/activate
+cd ..
+
+#echo "${@}"
+python ./fourcell/guide.py "${@}"
\ No newline at end of file