Why OPENCV lost exif infomation of JPEG?

C++
1

OPENCV version: 4.5.1

When I transform a JPEG with orientation information, the result didn’t have orientation information.

I used flags IMREAD_UNCHANGED and I expect exif information can save after image process, such as chagne quality.

2

it’s not entirely lost (it just never leaves the imprter code)
if your image had some exif rotation, imread() will return an already rotated image
please cross-check with IMREAD_IGNORE_ORIENTATION

no, there is no exif information stored for your image, and no exif saved

3

Thanks for reply.

My scenes is:
I use opencv do some specific actions, but whether use exif to rotate image rely to client’s behavior. So I need exif after image transform by OpenCV.

Could you give me some suggestion？

4

you could open an issue as feature request Issues · opencv/opencv · GitHub

5

maybe you want to use imagemagick. OpenCV is for computer vision, not for saving pictures in different formats.

cv::imread returns a cv::Mat. Mat objects contain only image data, no exif information. as mentioned, rotation info is applied to the data upon loading, but that is all.

6

I prefer OpenCV because its high performance. I will open an issue and expect you will consider to support this. Thanks~

7

issue: [feature request]: Save exif information · Issue #21789 · opencv/opencv · GitHub