What EXIF lib can I use from a Qt program (on embedded linux)?

Question

Can anybody recommend a nice exif lib for tiff img that can be used with a Qt program? I would like to both read and write exif data.

Please note that that I need a

Answer 1

You can use the libjpeg-exif library, it includes tools manipulate and read EXIF data.

Answer 2

Even if it is not Qt-related, probably your best option is the libexif C EXIF library. It is a GNOME core library (thus is widely deployed, tested and documented), still it is completely toolkit-agnostic, has no dependences and is LGPL licensed. It is a C library, thus its API is not idiomatic of Qt, nonetheless it is powerful and easy to use.

I've seen a lot of Qt-based software that prefer to use the exiv2 library, which is written in C++, but exiv2 is GPL (with option to buy a commercial license) and offers more or less the same functionality of libexif. My suggestion is to try libexif and, only if it does not satisfy your requirements, try exiv2.