Package: wnpp Severity: wishlist Package name : jhead Upstream Author: Matthias Wandel URL: http://www.sentex.net/~mwandel/jhead/ License: Public Domain
This blurb cut/pasted from the above URL: 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. Most editing / viewing software just skips past the Exif header and ignores it outright, so you normally don't notice its even there. Because I am interested in photography, I am always curious just exactly what settings my fully automatic digital camera actually did end up using. There's a few programs out there that can parse some of these headers, but I couldn'd find one that I could compile to an executable, and none that actually figured out what the camera settings were from the various confusing ways in which the fields can be expressed. Parsing the data of interest out of an Exif header is not straightforward. There is a large number of ways that simple data such as shutter speed or aperture setting can be expressed in inside of an Exif header. It can be an integer of various forms, or a fraction or floating point, which must subsequently be raised to a power to get the true value. Then it can be stored big-endian or little endian, and there are different fields for expressing the same values! It sounds like complete eveolutionary anarchy, but I think its just a comitee designed spec. With all its complexity, interestingly enough, plain text ASCII would both be smaller in size and easier to parse! So I wrote this command line driven program to parse through the little file system in the Exif headers and extract the stuff I really care about -- - Dave Baker : [EMAIL PROTECTED] : [EMAIL PROTECTED] : http://dsb3.com/ - GnuPG: 1024D/D7BCA55D / 09CD D148 57DE 711E 6708 B772 0DD4 51D5 D7BC A55D
