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![iPhoneからアップロードしたJPEG写真が横向きになる問題(EXIF, Orientation) - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/6849ba8b91f6803953b73f9952f3c9677ffde5ef/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-1150d8b18a7c15795b701a55ae908f94.png%3Fixlib%3Drb-1.2.2%26w%3D1200%26mark%3Dhttps%253A%252F%252Fqiita-user-contents.imgix.net%252F~text%253Fixlib%253Drb-1.2.2%2526w%253D840%2526h%253D380%2526txt%253DiPhone%2525E3%252581%25258B%2525E3%252582%252589%2525E3%252582%2525A2%2525E3%252583%252583%2525E3%252583%252597%2525E3%252583%2525AD%2525E3%252583%2525BC%2525E3%252583%252589%2525E3%252581%252597%2525E3%252581%25259FJPEG%2525E5%252586%252599%2525E7%25259C%25259F%2525E3%252581%25258C%2525E6%2525A8%2525AA%2525E5%252590%252591%2525E3%252581%25258D%2525E3%252581%2525AB%2525E3%252581%2525AA%2525E3%252582%25258B%2525E5%252595%25258F%2525E9%2525A1%25258C%252528EXIF%25252C%252520Orientation%252529%2526txt-color%253D%252523333%2526txt-font%253DHiragino%252520Sans%252520W6%2526txt-size%253D54%2526txt-clip%253Dellipsis%2526txt-align%253Dcenter%25252Cmiddle%2526s%253Da4463357b1b2e0ca2644a71d9777d906%26mark-align%3Dcenter%252Cmiddle%26blend%3Dhttps%253A%252F%252Fqiita-user-contents.imgix.net%252F~text%253Fixlib%253Drb-1.2.2%2526w%253D840%2526h%253D500%2526txt%253D%252540RichardImaokaJP%2526txt-color%253D%252523333%2526txt-font%253DHiragino%252520Sans%252520W6%2526txt-size%253D45%2526txt-align%253Dright%25252Cbottom%2526s%253Dc9453d38030217c7936d01d7167de0a2%26blend-align%3Dcenter%252Cmiddle%26blend-mode%3Dnormal%26s%3D1f8e949bbcf1e6aa16535e6c381ad8b5)
経緯 仕様はここに書いてありますが、私は何回読んでも理解できませんでした。 もっと分かりやすい説明はないかとネット上を探し回ったら、ありました。 CPANのImage::ExifToolのソースコードの中に分かりやすい対照表が。 http://cpansearch.perl.org/src/EXIFTOOL/Image-ExifTool-7.60/lib/Image/ExifTool/Exif.pm Perlコミュニティの底力を垣間見ました。 脱帽です。 %orientation = ( 1 => 'Horizontal (normal)', 2 => 'Mirror horizontal', 3 => 'Rotate 180', 4 => 'Mirror vertical', 5 => 'Mirror horizontal and rotate 270 CW', 6 => 'Rotate
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