[Bug in XnConvert] XnConvert - Rotate based on EXIF orientation

[sx090]

The standaone version of XNConvert will only be released in future, right?
Because I just checked for an update, but it seems there is no update as of now.
Still on XnConvert Version 1.105.0 - windows x64 (Apr 16 2025) - Libformat version 7.221

[sx090]

Hi Pierre,
it seems to work in XnViewmp -> Convert
Do you also plan to release a new standalone XnConvert version? I have the latest installed but it still shows as Version from April '25 without this fix included.

Would be very welcome, Thanks

[xnview]

Do you also plan to release a new standalone XnConvert version? I have the latest installed but it still shows as Version from April '25 without this fix included.

yes soon

[sx090]

Hi Pierre,

I’m following up on my earlier report in this thread.
Thanks again for looking into it and for fixing the previous bug.

I’ve now recompressed one of the original Galaxy S23 JPEGs with XnConvert (Windows), using JPEGLi as shown previously as output and “Rotate based on EXIF” afterwards again in XnViewMP. The result looks fine in most viewers, but I still see something strange in the EXIF thumbnail metadata.

When I open the converted file in XnView MP and look at the EXIF:

The main image is 3000 × 4000 pixels, Orientation = Horizontal (normal) – which is what I expect.
The embedded EXIF thumbnail is reported as 512 × 384 pixels (landscape orientation)?

If I extract the thumbnail image (e.g. with XnView MP or exiftool), the thumbnail itself looks correct, but the thumbnail size fields in the EXIF panel still show 512 × 384, which doesn’t match the portrait aspect of the main image.
I’ve attached:

the original converted JPEG:
https://www.dropbox.com/scl/fi/3brsd3pv ... t64xl&dl=0

When extracting hte Thumbnail using this cmd:

Code: Select all

exiftool -b ThumbnailImage 20250817_150706.jpg > thumbnail.jpg

as I mentioned, it looks good when viewing it ... (portrait orientation).

But the thumbnail width/height in EXIF does NOT look right:

2025-12-05_19h56_34.jpg (66.93 KiB) Viewed 47 times

2025-12-05_19h57_58.jpg (31.41 KiB) Viewed 47 times

Could you please check whether the embedded thumbnail size metadata is being written correctly by XnConvert and/or XnViewMP in this case, or if there is still some inconsistency left over from the rotation step?

Thanks a lot in advance!

[sx090]

I think the issue is that the "recalculated Thumbnail" in EXIF does have wrong thumbnail width/height... and this is NOT properly recalculated.

Would it be possible to also add a "correction" of EXIF thumbnail resolution within the thumbnail binary? OR remove it completely, also fine?

Thanks!