jhead is an open source command line driven utility for extracting digital camera settings from the Exif format files used by many digital cameras. It handles the various confusing ways these can be expressed, and displays them as F-stop, shutter speed, etc.
This tool is also able to reduce the size of digital camera JPEGs without loss of information, by deleting integral thumbnails that digital cameras put into the Exif header.
Many projects, including PHP, have reused code from this utility.
- Extracting camera settings from Exif image files.
- Able to set and/or adjust the Exif time field.
- Manipulation (extract, replace, regenerate) of Exif integral thumbnails.
- Transplant Exif image header from one JPEG to another.
- Edit JPEG comment fields.
- Automatically rotate images upright (using jpegtran) according to “orientation” tag.
- Manage running programs on large batches of Jpegs and restoring Exif header information afterwards.
- Display embedded GPS info (if present).
- Extracts the following from an Exif jpeg file:
- Time and date picture was taken.
- Camera make and model.
- Integral low-res Exif thumbnail.
- Shutter speed.
- Camera F-stop number.
- Flash used (yes/no).
- Distance camera was focused at.
- Focal length and calculate 35 mm equivalent focal length.
- Image resolution.
- GPS info, if stored in image.
- IPTC header.
- XMP data.
- Modifies the following from an Exif jpeg file:
- Up-right images according to rotation tag using jpegtran.
- Set or relative adjust internal exif timestamps.
- Fix date / time offsets in large batches of images.
- Rename or date stamp files according to exif timestamp.
- Transfer exif headers between images.
- Replace thumbnails inside Exif headers.
- Edit jpeg comments (but not the Exif comments).
- Delete exif or comment sections from jpeg images.
- Create new minimal exif header containing date and thumbnail.
- Options for manipulating Exif files including the date in the header, renaming image files, or coordinating running Jpegtran and Mogrify to manipulate whole directory trees of images.
|New to Linux? Read our Linux for Starters series. We start right at the basics and teach you everything you need to know to get started with Linux.|
|The largest compilation of the best free and open source software in the universe. Each article is supplied with a legendary ratings chart helping you make informed decisions.|
|Hundreds of in-depth reviews offering our unbiased and expert opinion on software. We offer helpful and impartial information.|
|Replace proprietary software with open source alternatives: Google, Microsoft, Apple, Adobe, IBM, Autodesk, Oracle, Atlassian, Corel, Cisco, Intuit, and SAS.|
|Getting Started with Docker helps you master Docker, a set of platform as a service products that delivers software in packages called containers.|
|Essential Linux system tools focuses on small, indispensable utilities, useful for system administrators as well as regular users.|
|Linux utilities to maximise your productivity. Small, indispensable tools, useful for anyone running a Linux machine.|
|Home computers became commonplace in the 1980s. Emulate home computers including the Commodore 64, Amiga, Atari ST, ZX81, Amstrad CPC, and ZX Spectrum.|
|Now and Then examines how promising open source software fared over the years. It can be a bumpy ride.|
|Linux at Home looks at a range of home activities where Linux can play its part, making the most of our time at home, keeping active and engaged.|
|Linux Candy reveals the lighter side of Linux. Have some fun and escape from the daily drudgery.|
|Best Free Android Apps. We showcase free Android apps that are definitely worth downloading. There's a strict eligibility criteria for inclusion in this series.|
|These best free books accelerate your learning of every programming language. Learn a new language today!|
|These free tutorials offer the perfect tonic to our free programming books series.|
|Stars and Stripes is an occasional series looking at the impact of Linux in the USA.|