File size smaller after lossless rotation - normal?

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Benrasi
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Joined: Wed Dec 05, 2018 5:56 pm

File size smaller after lossless rotation - normal?

Post by Benrasi » Mon Dec 31, 2018 2:44 am

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
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Re: File size smaller after lossless rotation - normal?

Post by cday » Mon Dec 31, 2018 7:40 am

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
Posts: 6
Joined: Wed Dec 05, 2018 5:56 pm

Re: File size smaller after lossless rotation - normal?

Post by Benrasi » Mon Dec 31, 2018 12:43 pm

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.

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xnview
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Re: File size smaller after lossless rotation - normal?

Post by xnview » Wed Jan 02, 2019 11:13 am

the data is not changed, only compression...
Pierre.

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