Adjusting cell phone photo orientation with Go
Somehow, I seem to hold my cell phone wrong when taking pictures. It often happens that a picture that looks right in the phone's photo gallery is suddenly upside down or on its side when I want to send it to friends on WhatsApp. A quick look at the metadata of the photo in question reveals what's going wrong (Listing 1) [1].
It appears that my phone is saving images with the wrong orientation, but it is also storing the correction value, which shows up in the JPEG format's Exif header to tell you how the photo actually should be rotated. I don't know who came up with this idea, but assuming that any app looks in the Exif header first and then aligns the image correctly seems like a fundamental flaw to me. There's no doubt in my mind that the original camera app should perform the rotation when the picture is taken, rather than having the work done downstream time and time again by an unmanageable number of photo apps.
Upside Down World
Figure 1 illustrates that the cell phone still displays the image the right way round in its photo app, even though it was stored incorrectly. The desktop version of the Whatsapp client in the browser, however, obviously ignores the associated Exif header and sends the picture upside down (Figure 2). Imagine the recipient's reaction to receiving a message about my surf trip to Ocean Beach in San Francisco with a photo on its head!
[...]
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Support Our Work
Linux Magazine content is made possible with support from readers like you. Please consider contributing when you’ve found an article to be beneficial.
News
-
Nitrux 6.0 Now Ready to Rock Your World
The latest iteration of the Debian-based distribution includes all kinds of newness.
-
Linux Foundation Reports that Open Source Delivers Better ROI
In a report that may surprise no one in the Linux community, the Linux Foundation found that businesses are finding a 5X return on investment with open source software.
-
Keep Android Open
Google has announced that, soon, anyone looking to develop Android apps will have to first register centrally with Google.
-
Kernel 7.0 Now in Testing
Linus Torvalds has announced the first Release Candidate (RC) for the 7.x kernel is available for those who want to test it.
-
Introducing matrixOS, an Immutable Gentoo-Based Linux Distro
It was only a matter of time before a developer decided one of the most challenging Linux distributions needed to be immutable.
-
Chaos Comes to KDE in KaOS
KaOS devs are making a major change to the distribution, and it all comes down to one system.
-
New Linux Botnet Discovered
The SSHStalker botnet uses IRC C2 to control systems via legacy Linux kernel exploits.
-
The Next Linux Kernel Turns 7.0
Linus Torvalds has announced that after Linux kernel 6.19, we'll finally reach the 7.0 iteration stage.
-
Linux From Scratch Drops SysVinit Support
LFS will no longer support SysVinit.
-
LibreOffice 26.2 Now Available
With new features, improvements, and bug fixes, LibreOffice 26.2 delivers a modern, polished office suite without compromise.