某所のコミケの原稿、LibreOfficeのファイルサイズが大きいということで、ファイルサイズの削減にチャレンジ。
$ ls -alh
合計 9.5M
drwxrwxr-x 3 nanbuwks nanbuwks 4.0K 8月 1 10:45 .
drwxr-xr-x 118 nanbuwks nanbuwks 104K 8月 1 10:29 ..
-rw-rw-r-- 1 nanbuwks nanbuwks 5.6M 8月 1 10:28 C93test.odt
ふむ、まずは中身を見てみる。
$ mkdir dist
$ cd dist
$ unzip ../C93test.odt
Archive: ../C93test.odt
extracting: mimetype
extracting: Thumbnails/thumbnail.png
inflating: layout-cache
creating: Configurations2/floater/
creating: Configurations2/toolbar/
creating: Configurations2/images/Bitmaps/
inflating: Configurations2/accelerator/current.xml
creating: Configurations2/progressbar/
creating: Configurations2/popupmenu/
creating: Configurations2/statusbar/
creating: Configurations2/menubar/
creating: Configurations2/toolpanel/
inflating: content.xml
inflating: meta.xml
inflating: manifest.rdf
inflating: settings.xml
inflating: styles.xml
extracting: Pictures/10000000000003B2000002663104167F68DF6931.jpg
extracting: Pictures/100002010000001000000010F9970A9B446EDA8D.png
extracting: Pictures/10000000000002020000016E3600C0D6E217BD91.jpg
extracting: Pictures/100000000000020800000172724EB8809F1FB5E8.jpg
extracting: Pictures/1000000000000306000002889ECB54087B847EE7.jpg
extracting: Pictures/10000000000002F80000021E8684805ECC07B8F4.jpg
extracting: Pictures/1000000000000150000000EE6B4B38DC6F45FB07.jpg
extracting: Pictures/1000000000000150000000EECB8BDCE8E44F7A2D.jpg
extracting: Pictures/10000000000003D2000003AAE1ACA9292B9BD2E3.jpg
extracting: Pictures/10000000000001F800000165E17A3CA73825602E.jpg
extracting: Pictures/1000000000000320000002584128EEF77C2053F9.jpg
extracting: Pictures/10000201000004F5000003EA0A79E4D769A6CBDD.png
extracting: Pictures/10000000000007080000055D5023CFB285A0CF0E.jpg
extracting: Pictures/10000000000001F8000001519A2880DA5F5CB1F7.jpg
extracting: Pictures/1000000000000150000000EE870A56D4158FD0E8.jpg
extracting: Pictures/10000000000004000000030038FC945FAB091CF0.jpg
extracting: Pictures/1000020100000256000002007E798D179AD4DB6E.png
extracting: Pictures/100002010000049E000003F688FE32D1FDD8D97B.png
extracting: Pictures/10000201000006750000048DFE72C1A096127FDB.png
extracting: Pictures/10000201000002AA0000021C90B1BD1A4366DF7E.png
extracting: Pictures/1000000000000150000000EE33E962F39832582F.jpg
extracting: Pictures/10000201000002BA000001A7EBD8C3B7DA0C9C18.png
extracting: Pictures/1000000000000150000000EEC572001EE8951894.jpg
extracting: Pictures/100000000000022D000001C6AC7FBA43E9A2DA73.jpg
extracting: Pictures/1000000000000140000000BE7036A9D9E0BF77B3.jpg
extracting: Pictures/1000000000000008000000083379E409CE935A89.png
extracting: Pictures/100000000000020E00000176D3C3B9FDB56BE940.jpg
extracting: Pictures/10000000000001D200000163A8B99FBCBCB934AC.jpg
inflating: META-INF/manifest.xml
まあ、作業すべきはPicturesでしょう。
$ cd Pictures/
$ ls -alh
合計 5.6M
drwxrwxr-x 2 nanbuwks nanbuwks 4.0K 8月 1 10:43 .
drwxrwxr-x 6 nanbuwks nanbuwks 4.0K 8月 1 10:43 ..
-rw-rw-r-- 1 nanbuwks nanbuwks 69 7月 31 08:34 1000000000000008000000083379E409CE935A89.png
-rw-rw-r-- 1 nanbuwks nanbuwks 18K 7月 31 08:34 1000000000000140000000BE7036A9D9E0BF77B3.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 23K 7月 31 08:34 1000000000000150000000EE33E962F39832582F.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 18K 7月 31 08:34 1000000000000150000000EE6B4B38DC6F45FB07.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 21K 7月 31 08:34 1000000000000150000000EE870A56D4158FD0E8.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 16K 7月 31 08:34 1000000000000150000000EEC572001EE8951894.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 20K 7月 31 08:34 1000000000000150000000EECB8BDCE8E44F7A2D.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 88K 7月 31 08:34 10000000000001D200000163A8B99FBCBCB934AC.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 87K 7月 31 08:34 10000000000001F8000001519A2880DA5F5CB1F7.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 34K 7月 31 08:34 10000000000001F800000165E17A3CA73825602E.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 39K 7月 31 08:34 10000000000002020000016E3600C0D6E217BD91.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 59K 7月 31 08:34 100000000000020800000172724EB8809F1FB5E8.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 46K 7月 31 08:34 100000000000020E00000176D3C3B9FDB56BE940.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 91K 7月 31 08:34 100000000000022D000001C6AC7FBA43E9A2DA73.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 42K 7月 31 08:34 10000000000002F80000021E8684805ECC07B8F4.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 94K 7月 31 08:34 1000000000000306000002889ECB54087B847EE7.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 465K 7月 31 08:34 1000000000000320000002584128EEF77C2053F9.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 70K 7月 31 08:34 10000000000003B2000002663104167F68DF6931.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 254K 7月 31 08:34 10000000000003D2000003AAE1ACA9292B9BD2E3.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 110K 7月 31 08:34 10000000000004000000030038FC945FAB091CF0.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 1.2M 7月 31 08:34 10000000000007080000055D5023CFB285A0CF0E.jpg
-rw-rw-r-- 1 nanbuwks nanbuwks 687 7月 31 08:34 100002010000001000000010F9970A9B446EDA8D.png
-rw-rw-r-- 1 nanbuwks nanbuwks 34K 7月 31 08:34 1000020100000256000002007E798D179AD4DB6E.png
-rw-rw-r-- 1 nanbuwks nanbuwks 67K 7月 31 08:34 10000201000002AA0000021C90B1BD1A4366DF7E.png
-rw-rw-r-- 1 nanbuwks nanbuwks 58K 7月 31 08:34 10000201000002BA000001A7EBD8C3B7DA0C9C18.png
-rw-rw-r-- 1 nanbuwks nanbuwks 257K 7月 31 08:34 100002010000049E000003F688FE32D1FDD8D97B.png
-rw-rw-r-- 1 nanbuwks nanbuwks 790K 7月 31 08:34 10000201000004F5000003EA0A79E4D769A6CBDD.png
-rw-rw-r-- 1 nanbuwks nanbuwks 1.7M 7月 31 08:34 10000201000006750000048DFE72C1A096127FDB.png
1.2Mのと1.7Mの画像ファイルがありますね。最後の1.7Mのファイルをターゲットにしてみます。
このファイルは何の画像かな？
$ display 10000201000006750000048DFE72C1A096127FDB.png
画像の大きさはどれくらいだろう？
$ identify -format "%w %h" 10000201000006750000048DFE72C1A096127FDB.png
1653 1165
ふむふむ。この画像がどこに使われているのかな？
$ libreoffice ../../C93test.odt
小さい扱いなので、画像サイズはもっと小さくてもいいですね。
$ mogrify -resize 300 10000201000006750000048DFE72C1A096127FDB.png
$ ls -alh 10000201000006750000048DFE72C1A096127FDB.png
-rw-rw-r-- 1 nanbuwks nanbuwks 91K 8月 1 10:44 10000201000006750000048DFE72C1A096127FDB.png
小さくなったよ！
1.2Mのファイルについても同様に作業してから、
$ cd ..
$ zip -r ../C93test2.odt *
updating: Configurations2/ (stored 0%)
updating: Configurations2/accelerator/ (stored 0%)
updating: Configurations2/accelerator/current.xml (stored 0%)
updating: Configurations2/progressbar/ (stored 0%)
updating: Configurations2/toolpanel/ (stored 0%)
updating: Configurations2/floater/ (stored 0%)
updating: Configurations2/images/ (stored 0%)
updating: Configurations2/images/Bitmaps/ (stored 0%)
updating: Configurations2/menubar/ (stored 0%)
updating: Configurations2/toolbar/ (stored 0%)
updating: Configurations2/popupmenu/ (stored 0%)
updating: Configurations2/statusbar/ (stored 0%)
updating: META-INF/ (stored 0%)
updating: META-INF/manifest.xml (deflated 82%)
updating: Pictures/ (stored 0%)
updating: Pictures/100002010000001000000010F9970A9B446EDA8D.png (stored 0%)
updating: Pictures/10000201000002AA0000021C90B1BD1A4366DF7E.png (deflated 9%)
updating: Pictures/10000000000001D200000163A8B99FBCBCB934AC.jpg (deflated 1%)
updating: Pictures/10000201000002BA000001A7EBD8C3B7DA0C9C18.png (deflated 5%)
updating: Pictures/10000000000004000000030038FC945FAB091CF0.jpg (deflated 0%)
updating: Pictures/1000000000000150000000EE870A56D4158FD0E8.jpg (deflated 1%)
updating: Pictures/10000201000006750000048DFE72C1A096127FDB.png (deflated 0%)
updating: Pictures/10000000000003B2000002663104167F68DF6931.jpg (deflated 10%)
updating: Pictures/1000020100000256000002007E798D179AD4DB6E.png (deflated 9%)
updating: Pictures/100000000000022D000001C6AC7FBA43E9A2DA73.jpg (deflated 0%)
updating: Pictures/1000000000000150000000EE33E962F39832582F.jpg (deflated 1%)
updating: Pictures/1000000000000008000000083379E409CE935A89.png (deflated 9%)
updating: Pictures/10000000000001F800000165E17A3CA73825602E.jpg (deflated 1%)
updating: Pictures/1000000000000320000002584128EEF77C2053F9.jpg (deflated 3%)
updating: Pictures/10000000000003D2000003AAE1ACA9292B9BD2E3.jpg (deflated 0%)
updating: Pictures/10000201000004F5000003EA0A79E4D769A6CBDD.png (deflated 1%)
updating: Pictures/100002010000049E000003F688FE32D1FDD8D97B.png (deflated 6%)
updating: Pictures/10000000000002020000016E3600C0D6E217BD91.jpg (deflated 3%)
updating: Pictures/1000000000000140000000BE7036A9D9E0BF77B3.jpg (deflated 6%)
updating: Pictures/1000000000000150000000EECB8BDCE8E44F7A2D.jpg (deflated 1%)
updating: Pictures/10000000000002F80000021E8684805ECC07B8F4.jpg (deflated 6%)
updating: Pictures/1000000000000150000000EE6B4B38DC6F45FB07.jpg (deflated 1%)
updating: Pictures/10000000000007080000055D5023CFB285A0CF0E.jpg (deflated 13%)
updating: Pictures/10000000000001F8000001519A2880DA5F5CB1F7.jpg (deflated 18%)
updating: Pictures/100000000000020800000172724EB8809F1FB5E8.jpg (deflated 2%)
updating: Pictures/100000000000020E00000176D3C3B9FDB56BE940.jpg (deflated 2%)
updating: Pictures/1000000000000306000002889ECB54087B847EE7.jpg (deflated 4%)
updating: Pictures/1000000000000150000000EEC572001EE8951894.jpg (deflated 2%)
updating: Thumbnails/ (stored 0%)
updating: Thumbnails/thumbnail.png (deflated 0%)
updating: content.xml (deflated 82%)
updating: layout-cache (deflated 57%)
updating: manifest.rdf (deflated 71%)
updating: meta.xml (deflated 53%)
updating: mimetype (stored 0%)
updating: settings.xml (deflated 85%)
updating: styles.xml (deflated 88%)
としてファイルを作りなおしました。
$ cd ..
$ ls -alh
合計 8.6M
drwxrwxr-x 3 nanbuwks nanbuwks 4.0K 8月 1 10:51 .
drwxr-xr-x 118 nanbuwks nanbuwks 104K 8月 1 10:29 ..
-rw-rw-r-- 1 nanbuwks nanbuwks 5.6M 8月 1 10:28 C93test.odt
-rw-rw-r-- 1 nanbuwks nanbuwks 2.9M 8月 1 10:51 C93test2.odt
drwxrwxr-x 6 nanbuwks nanbuwks 4.0K 8月 1 10:43 dist
半分ぐらいに小さくなりました。
$ libreoffice C93test2.odt
できたものを確認して、問題なければ終了です。