File size smaller after lossless rotation - normal?

[Benrasi]

Is it normal that the file size is smaller after doing a lossless rotation?

The original file has 5262 KB, after only 4308 KB.

I notice in the EXIF a different Sub-sampling, but a better one in the rotated file. From 2x1, 1x1, 1x1 --> 1x1, 1x1, 1x1

Thanks,
Ben

[cday]

Are you familiar with File > Format setting... > Write -- JPEG ?

It's rather hidden, but possibly the file has also been saved with a slightly lower Quality setting?

[Benrasi]

I know the setting, but it should not influence the lossless - otherwise it would be the wrong name - but to make sure I checked with a much lower save quality setting and it has no result on the described difference. Normal rotation and save is done with this setting, I approved.

Can anyone try to loosless rotate an image and check the file size ?

I'm running version 0.92 on Kubuntu Linux.

[xnview]

the data is not changed, only compression...