How change exif data of my JPG picture?
lazarus / 39-Graphics

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seba22 · 2010-12-13 12:10

Welcome,
I have question i have picture jpg.

That picture contain metadata called exif.

Any idea how can i edit exif tags under lazarus ?

I just want repleace specificated tag for example author tag "Picasa
3.0" for mine "edited by my application xxx".

Right now im doing this using external application called exiftool but
i want run this on windows and linux. So i cant use standalone
application for that. I tried simple  repleace phrase "Picasa 3.0" for
- "mystring mystring mystring" but it fail.

I succesfully change few letters inside exif, but overal count must be
this same.

Any idea ? :>
Regards

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Blaazen · 2010-12-13 17:01

There must be something like:

1) length of string (usually 2 bytes (Hi byte, Low byte)
2) text itself.

So if you need other count of letters you must change the bytes before
text.

I recommend you to download some manual (specifications) of JPEG
files. I have one (but old, from 1999) and here is written something
about tag "COM", which is comment in jpeg file.

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DirkS · 2010-12-14 01:48

You can find the current spec (Exif 2.3) here:
http://www.cipa.jp/english/hyoujunka/kikaku/pdf/DC-008-2010_E.pdf and
older specs on this page: http://www.exif.org/specifications.html.

TBH: it's far easier to use a (free) tool such as ExifTool /
ExifToolGUI than to mess with this yourself...

Gr.
Dirk.

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boardhead · 2010-12-14 13:51

Quote from: seba22 on December 13, 2010, 01:10:50 pmRight now im doing
this using external application called exiftool but i want run this on
windows and linux.

... but exiftool does work on Windows and Linux (and Mac too).

The command line would be:

exiftool -software="edited by my application xxx" FILE

- Phil

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seba22 · 2010-12-18 20:59

Thank you

It's working.

It's nice to see that exiftool is also compiled to Windows

I think this topic is closed