How does JPEG endianness matter on coding?

Question

I\'m currently working on a big project that involve pictures. One of the big issues I\'m having is with the endianness of the picture (jpeg to be clearer). I always though

Answer 1

Ok so I found my answer by asking question to Phil, the author of exiftool

You can see the thread I had with him here.

1. Yes it's possible. The 3rd party SDK was not aware that the exif header could be encoded using little-endian or big-endian and was only reading using little-endian. Changing all my picture to little-endian fixed the problem.
2. 2 parts answer: First, the data of a jpeg is always big endian as said in my edit. Second, the exif header can be in either little-endian or big-endian and it's possible to change it using exiftool.

In command line:

exiftool -all= -tagsfromfile test.jpg -all:all -unsafe -exifbyteorder=little-endian test.jpg

You can also found a wrapper for the tool in almost any language in this page.

Thanks a lot for your interest in the question and the answer I received.