From 82c2ea77b4553539b7f846e56e0d04bd1345ce0c Mon Sep 17 00:00:00 2001
From: RealStickman <mrc@frm01.net>
Date: Sun, 13 Feb 2022 13:36:49 +0100
Subject: [PATCH] Likely double pages don't get split anymore

---
 .../scripts/pieces/manga-double-split.sh      | 64 +++++++++++++++----
 1 file changed, 53 insertions(+), 11 deletions(-)

diff --git a/arch-config/scripts/pieces/manga-double-split.sh b/arch-config/scripts/pieces/manga-double-split.sh
index b0337803..873709c9 100755
--- a/arch-config/scripts/pieces/manga-double-split.sh
+++ b/arch-config/scripts/pieces/manga-double-split.sh
@@ -27,18 +27,60 @@ for image in "${images[@]}"; do
     num=$(echo "$noext" | grep -Eoe [0-9]{3})
     # strip leading 0s
     num="${num##+(0)}"
+    # if number is empty (like with 000), set it to 0
     [[ -z "${num}" ]] && num=0
-    if (( $(echo "$ratio > 1" |bc -l) )); then
-        # crop image in half
-        convert -crop 50%x100% "$image" "../$out/$noext-%d.jpeg"
-        # rename the -1, which is the first page to the original name
-        mv "../$out/$noext-1.jpeg" "../$out/page${num}.jpeg"
-        # increment image number
-        ((num++))
-        # rename -0 to original image + 1 name
-        mv "../$out/$noext-0.jpeg" "../$out/page${num}.jpeg"
+    # images with horizontal orientation
+    if (( $(echo "$ratio > 1" | bc -l) )); then
+        # check whether image should be double or single paged
+        cropwidth=50
+        # get image measurements
+        width=$(identify -format "%w" "$image")
+        height=$(identify -format "%h" "$image")
+        left="$(convert "$image" -crop "${cropwidth}"x"${height}"+"$(echo "$width / 2 - $cropwidth" | bc -l)"+0 -resize 1x1\! -format "%[fx:mean]" info:-)"
+        right="$(convert "$image" -crop ${cropwidth}x${height}+$(echo "$width / 2" | bc -l)+0 -resize 1x1\! -format "%[fx:mean]" info:-)"
+        # if either left or right are above the threshold, split the image
+        if (( $(echo "$left > 0.93" | bc -l) )) || (( $(echo "$right > 0.93" | bc -l) )); then
+            # crop image in half
+            convert -crop 50%x100% "$image" "../$out/$noext-%d.jpeg"
+            # rename the -1, which is the first page to the original name
+            mv "../$out/$noext-1.jpeg" "../$out/page${num}.jpeg"
+            # increment image number
+            ((num++))
+            # rename -0 to original image + 1 name
+            mv "../$out/$noext-0.jpeg" "../$out/page${num}.jpeg"
+        # copy double pages
+        else
+            cp "$image" "../$out/page${num}.jpeg"
+        fi
+    # images with vertical orientation
     else
-        # move all other images
-        mv "$image" "../$out/page${num}.jpeg"
+        # copy all other images
+        cp "$image" "../$out/page${num}.jpeg"
     fi
 done
+
+# find average color in an area
+# %[fx:int(255*r+.5)]: color value of R-channel
+# %[fx:mean]: overall brightness from 0 to 1
+# %[fx:mean.r]: brightness from 0 to 1 for R-channel
+#convert page001.jpeg -crop (area width)x(area height)+(x-coord top left)+(y-coord to left) -resize 1x1\! -format "%[fx:int(255*r+.5)],%[fx:int(255*g+.5)],%[fx:int(255*b+.5)]" info:-
+#convert page001.jpeg -crop 50x1650+1109+0 -resize 1x1\! -format "%[fx:mean],%[fx:mean.r],%[fx:mean.g],%[fx:mean.b]," info:-
+
+# left
+#convert page001.jpeg -crop 50x1650+1109+0 -resize 1x1\! -format "%[fx:mean]" info:-
+# right
+#convert page001.jpeg -crop 50x1650+1159+0 -resize 1x1\! -format "%[fx:mean]" info:-
+
+# crop image to the area specified
+#convert page001.jpeg -crop 100x1650+1109+0 page001-test.jpeg
+
+# one crop left and one crop right
+# if either one is over the threshold, we split the image
+#convert page001.jpeg -crop (crop width)x(image height)+(half image width - crop width)+0 page001-left.jpeg
+#convert page001.jpeg -crop (crop width)x(image height)+(half image width)+0 page001-right.jpeg
+
+# some values
+# for split, find lower numbers
+# to split: 0.969366
+# for not split, find highest numbers
+# not split: 0.917692