When I look around EXIF seems to extensively support all sorts of nonstandard or proprietary tags - just look at all the 'makertag' stuff. I haven't noticed anywhere in the manual where the actual dt XIF tag structure is documented but that doesn't surprise me at all. I see 100s of Pentax maker_tags that aren't defined in the Pentax manuals either, and I'm sure the same goes for all/some/most other manufacturers as well. With dt being open source though we do at least have the option of looking in the code if we are really that bothered (although there may be a more easily accessible definition file lying around somewhere).
The pairing of image and .xmp sidecar file is I think the mechanism used for storing of processing history in SOURCE files so that the source file, particularly when a raw file, does not have to be altered. When a new output file is generated that is an entirely different thing, and it is then that dt history stack is included in the output file tags, whether jpeg or other format. Quite why history is included like that I don't know, I guess it is useful to someone. Rgds, Rob. -----Original Message----- From: Willem Ferguson [mailto:[email protected]] Sent: 02 April 2013 15:02 To: [email protected] Subject: [Darktable-users] history in exif I have 2 questions: 1) As far as I am aware EXIF does not allow for writing of nonstandard data into the EXIF tag fields??? One of the reasons for using the flexibility of XMP sidecar files. I thought EXIF was supposed to be a standard, including a fairly rigid tag structure, derived from TIFF? Am I mistaken? 2) Where in the manual is this addressed? 2.2.8 refers to batch operations on selected files? [2. Panels 2.8. Selected image(s)] Cannot find text there that bears on this issue?? Kind regards, Willem Ferguson Am 01.04.2013 17:57, schrieb Alexander Wagner: > Hi! > > Recently, I learned that dt stores the processing history in the exif > information of the created JPG. I wonder if there is also a procedure > to recover this history from the JPG to a usable xmp-file for dt. Does > this exist? If so, how would one do that? > RTFM (Section 2.2.8) ------------------------------------------------------------------------------ Own the Future-Intel(R) Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users The content of this email is private and confidential, and unless otherwise stated only the intended recipient may use the content of this email for its intended purpose. If you are not the intended recipient, you may not retain, copy, forward or disclose the information herein, and we ask you to notify the sender or contact our Customer Services department on 0844 633 1000 or at [email protected] The copyright and all other intellectual property rights subsisting in or to the contents of this email belong to NHBC or are used with the permission of the owner and all such rights are reserved. Recipients are asked to note that opinions, conclusions and other information in the contents of this email that do not relate to the official business of NHBC are neither given nor endorsed by NHBC. This email has been scanned for viruses, but NHBC does not accept any liability in respect of loss or damage caused by any virus which is not detected by its virus detection systems. Data Protection Act 1998. NHBC is the Data Controller for the purposes of the Act. Your personal details will be stored and processed in accordance with the Act for the purposes of dealing with your enquiry or claim and for research and statistical purposes. If you make a claim under a Buildmark policy you agree to your data being passed to others involved with your claim such as the original builder, or a consultant or remedial works contractor that we may employ in connection with your claim(s) and matter ancillary to your claim(s). Other than disclosure provided for in this statement, we will not pass any data about you to any other party without your permission unless we are required to do so by law. NHBC, the National House-Building Council, is a company registered by guarantee in England, registration number 320784, and it is authorised and regulated by the Financial Services Authority. ------------------------------------------------------------------------------ Own the Future-Intel(R) Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://altfarm.mediaplex.com/ad/ck/12124-176961-30367-2 _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
