1.6.4: Cannot sync the ratings rated by Synology Photos

[tenpaMk2]

XnView: MP 1.6.4 - 64 bit
OS: Mac - 64bit

When rating the image by Synology Photos,
rating color star icons cannot be shown in browser/viewer.

This problem does not occur if it rated by XnView.

Effect:
I always manage my images with XnView and Synology Photos.
So, the ratings must be synced between 2 applications.
This problem break my management...

To reproduce:
1. Rate by Synology Photos.
2. Open the image by Xnview

Actual behaviour (bug):
The image rated by Synology Photos does not show rating color stars.

Expected behaviour:
The image rated by Synology Photos shows rating color.

Consideration:
This problem occurs maybe since Synology Photos 1.6.2-0710 that is released in some days.
From this version, Synology Photos mayby start using `Rating` and `Rating Percent` in Exif Tag.

The below image is rated by Synology Photos.

info-synology.png (63.04 KiB) Viewed 1125 times

These Exif tags are not added by XnView.
The below image is rated by XnView.

info-xnview.png (57.56 KiB) Viewed 1125 times

So, I think 2 applications depend on different tags for rating.
- Synology Photos: Exif `Rating` ( `Rating Percent` )
- XnView: XMP `Rating` ( `Rating Percent` )

If the above is correct, I want XnView to support Exif `Rating` tags, and it has higher priority than other `Rating` tags.

Appendix: Settings:

[tenpaMk2]

I found the doc that Synology uses Exif tags.

https://kb.synology.com/en-uk/DSM/tutor ... os_support

Rating equals the Image.Rating and Image.RatingPercent tags in the Exif standard and the Rating, RatingPercent, and MicrosoftPhoto tags in the Xmp standard.

[xnview]

XnView use the standard XMP field, it seems that this field is set too. Could you send me a sample file

[tenpaMk2]

Thank you for quick reply.
Sorry I forgot attaching. I do it now. See the attachements.

Synology Photos embed rating information into the Exif field.
I don't know whether it's common specification or not in the world.

[xnview]

It works here. So i think that file doesn't change 'file size' or 'modified date'. If you use 'View>Update catalog from files' after selecting these files?

[tenpaMk2]

Thanks!! It works for me.