[Desktop-packages] [Bug 381140] Re: jpegtran is NOT lossless with metadata (Exif data, etc.) by default
** Changed in: libjpeg6b (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libjpeg6b in Ubuntu. https://bugs.launchpad.net/bugs/381140 Title: jpegtran is NOT lossless with metadata (Exif data, etc.) by default Status in libjpeg6b package in Ubuntu: Fix Released Status in libjpeg6b package in Debian: Fix Released Bug description: From the man page: NAME jpegtran - lossless transformation of JPEG files ... ... But by the same token, jpegtran cannot perform lossy operations such as changing the image quality. ... -copy comments Copy only comment markers. This setting copies comments from the source file, but discards any other inessential data. -copy all Copy all extra markers. This setting preserves miscellaneous markers found in the source file, such as Exif data, JFIF thumb‐ nails and Photoshop settings. In some files these extra markers can be sizable. The default behavior is -copy comments. As you can see, jpegtran explicitly claims to be lossless. It even further claims it "cannot perform lossy operations". (I realize now that's only talking about image data.) But, the default for extra marker copying is "-copy comment", which drops Exif data. This means that every picture I've rotated with jpegtran has lost its Exif data. Luckily, I probably don't need it that bad, but I was using this tool explicitly because it's supposedly lossless. I realize that the man page is clear about the default value of -copy, but who reads an entire man page to find the one option that makes the description under NAME untrue? I propose these possible solutions, in order of preference: 1. Add a new argument to copy that behaves like -copy all, but *updates* the JFIF and/or EXIF thumbnails after transforming the image. Make this option the default. 2. Add a new argument to copy that behaves like -copy all, but *drops* (does not copy) the JFIF thumbnails. Make this option the default. 3. Make -copy all the default. 4. Add a new argument to copy that behaves like -copy comments, but also copies exif markers. Make this option the default. The first patch here might be useful, though I'm not sure if it also copies comments: https://bugzilla.redhat.com/show_bug.cgi?id=106060 5. Add an asterisk after lossless at the top of the man page and then add a note under it such as, '* The only extra markers copied by default are comments. This means certain data (Exif data, JFIF thumbnails, Photoshop settings, etc.) will be lost. To copy all extra markers, see the "-copy all" argument.' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libjpeg6b/+bug/381140/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
[Desktop-packages] [Bug 381140] Re: jpegtran is NOT lossless with metadata (Exif data, etc.) by default
** Changed in: libjpeg6b (Debian) Status: Fix Committed = Fix Released -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libjpeg6b in Ubuntu. https://bugs.launchpad.net/bugs/381140 Title: jpegtran is NOT lossless with metadata (Exif data, etc.) by default Status in “libjpeg6b” package in Ubuntu: Confirmed Status in “libjpeg6b” package in Debian: Fix Released Bug description: From the man page: NAME jpegtran - lossless transformation of JPEG files ... ... But by the same token, jpegtran cannot perform lossy operations such as changing the image quality. ... -copy comments Copy only comment markers. This setting copies comments from the source file, but discards any other inessential data. -copy all Copy all extra markers. This setting preserves miscellaneous markers found in the source file, such as Exif data, JFIF thumb‐ nails and Photoshop settings. In some files these extra markers can be sizable. The default behavior is -copy comments. As you can see, jpegtran explicitly claims to be lossless. It even further claims it cannot perform lossy operations. (I realize now that's only talking about image data.) But, the default for extra marker copying is -copy comment, which drops Exif data. This means that every picture I've rotated with jpegtran has lost its Exif data. Luckily, I probably don't need it that bad, but I was using this tool explicitly because it's supposedly lossless. I realize that the man page is clear about the default value of -copy, but who reads an entire man page to find the one option that makes the description under NAME untrue? I propose these possible solutions, in order of preference: 1. Add a new argument to copy that behaves like -copy all, but *updates* the JFIF and/or EXIF thumbnails after transforming the image. Make this option the default. 2. Add a new argument to copy that behaves like -copy all, but *drops* (does not copy) the JFIF thumbnails. Make this option the default. 3. Make -copy all the default. 4. Add a new argument to copy that behaves like -copy comments, but also copies exif markers. Make this option the default. The first patch here might be useful, though I'm not sure if it also copies comments: https://bugzilla.redhat.com/show_bug.cgi?id=106060 5. Add an asterisk after lossless at the top of the man page and then add a note under it such as, '* The only extra markers copied by default are comments. This means certain data (Exif data, JFIF thumbnails, Photoshop settings, etc.) will be lost. To copy all extra markers, see the -copy all argument.' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libjpeg6b/+bug/381140/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
[Desktop-packages] [Bug 381140] Re: jpegtran is NOT lossless with metadata (Exif data, etc.) by default
** Changed in: libjpeg6b (Debian) Status: New = Fix Committed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to libjpeg6b in Ubuntu. https://bugs.launchpad.net/bugs/381140 Title: jpegtran is NOT lossless with metadata (Exif data, etc.) by default Status in “libjpeg6b” package in Ubuntu: Confirmed Status in “libjpeg6b” package in Debian: Fix Committed Bug description: From the man page: NAME jpegtran - lossless transformation of JPEG files ... ... But by the same token, jpegtran cannot perform lossy operations such as changing the image quality. ... -copy comments Copy only comment markers. This setting copies comments from the source file, but discards any other inessential data. -copy all Copy all extra markers. This setting preserves miscellaneous markers found in the source file, such as Exif data, JFIF thumb‐ nails and Photoshop settings. In some files these extra markers can be sizable. The default behavior is -copy comments. As you can see, jpegtran explicitly claims to be lossless. It even further claims it cannot perform lossy operations. (I realize now that's only talking about image data.) But, the default for extra marker copying is -copy comment, which drops Exif data. This means that every picture I've rotated with jpegtran has lost its Exif data. Luckily, I probably don't need it that bad, but I was using this tool explicitly because it's supposedly lossless. I realize that the man page is clear about the default value of -copy, but who reads an entire man page to find the one option that makes the description under NAME untrue? I propose these possible solutions, in order of preference: 1. Add a new argument to copy that behaves like -copy all, but *updates* the JFIF and/or EXIF thumbnails after transforming the image. Make this option the default. 2. Add a new argument to copy that behaves like -copy all, but *drops* (does not copy) the JFIF thumbnails. Make this option the default. 3. Make -copy all the default. 4. Add a new argument to copy that behaves like -copy comments, but also copies exif markers. Make this option the default. The first patch here might be useful, though I'm not sure if it also copies comments: https://bugzilla.redhat.com/show_bug.cgi?id=106060 5. Add an asterisk after lossless at the top of the man page and then add a note under it such as, '* The only extra markers copied by default are comments. This means certain data (Exif data, JFIF thumbnails, Photoshop settings, etc.) will be lost. To copy all extra markers, see the -copy all argument.' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libjpeg6b/+bug/381140/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
