I want to change the EXIF orientation tag in my JPEG images but without actual rotating of them. I want to do this to use them as a test case for an application I made.
How I can do that in Linux? Can I do it with
exiftool? And if so, how?
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You can retrieve the existing orientation information via
exiftool as follows:
exiftool -Orientation -n image.jpg
This will display the internal value of the orientation information held in the MIE tags. You can return the value as an English string by omitting the
-n flag. You can find additional information here regarding particular rotation/orientation values.
Changing the orientation data with
exiftool can be done as follows:
exiftool -Orientation=1 -n image.jpg
Here, the orientation is set to 1, indicating no rotation. These numbers are defined as per the EXIF specification; you can see what effect different rotation values have in the link above.
(note: you must use the
-n argument when setting orientation to indicate that the value is numeric. If you forget, exiftool will interpret the
orientation=x number as a string and set the wrong rotation ie.
exiftool -orientation=1 image.jpg will actually set the orientation to 3 which is 'Rotate 180')