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 Readme for:  Graphics » Misc » jhead.lha

Jhead

Description: Exif Jpeg header manipulation tool
Download: jhead.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 156kb
Version: 2.90
Date: 19 Sep 2010
Author: Matthias Wandel port by Chris Young
Submitter: kas1e
Email: kas1e/yandex ru
Homepage: http://www.sentex.net/~mwandel/jhead/
Category: graphics/misc
Replaces: graphics/misc/jhead.lha
License: Other
Distribute: yes
Min OS Version: 4.0
FileID: 5941
 
Comments: 2
Snapshots: 0
Videos: 0
Downloads: 313  (Current version)
665  (Accumulated)
Votes: 1 (0/0)  (30 days/7 days)

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Port of the latest version of jhead.  I've added a little ARexx script which
prompts for a file and then shows all the Exif data.

The below text is taken from the author's website.
http://www.sentex.net/~mwandel/jhead/

Exif Jpeg header manipulation tool
Version 2.90
Updated Feb 05 2010

Things jhead can extract 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 	

Things jhead can modify in 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 
*	Re-name 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

The files coming out of a pretty much all Digital cameras are in the Exif
flavour of Jpeg files. Exif files are for the most part Jpeg files, but start
with a different header block, and contain additional data sections with camera
settings, as well as a preview thumbnail picture as part of the Exif header.
Many image browsers today make use of this integral thumbnail when browsing,
while other browsers make their own thumbnails based on the image as a whole. 

Because I am interested in photography, I am always curious just exactly what
settings my fully automatic digital camera actually did end up using. Back in
1999, when I originally wrote jhead, I couldn't find a program that would
consistently display the settings, nor one that could be compiled into a simple
executable. I have since added many more features to jhead, many of them the
result of suggestions or code contributions. 

Though there are many programs out there now that can manipulate Exif headers
today, for many tasks, jhead remains the simplest and most effective tool for
the job, especially if used for automated or scripted tasks.


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