1.9.5 - browser - thumbnails - issue with thumbnails generation

[user0]

XnViewMP 1.9.5
Windows11 (25H2), display resolution 3840x2160, dpi scale 150%

Browser - thumbnails
there is some issue with thumbnails generation (test files)

case A

1. t from t file via exiftool

   Code: Select all

   exiftool.exe -ThumbnailImage<=t.jpg -overwrite_original 1.jpg

   it works - OK
2. XnViewMP can read,rotate,delete,rebuild

case B

1. t from source file itself via exiftool

   Code: Select all

   exiftool.exe -ThumbnailImage<=1.jpg -overwrite_original 1.jpg

   Warning: [minor] Writing multi-segment EXIF - OK-ish ?
   
   Note: unfortunately exiftool cannot automatically generate resized thumbnail from main image,
   so file size became twice bigger. Not sure if it is still valid tbh.
2. open folder in Browser
   XnViewMP shows t in Exif info tab, but
   ignores this embedded thumbnail, does not show overlay icon and cannot rebuild

case C

1. t via XnViewMP
   1. open 'orig' folder in Browser
   2. select files and press 'EXIF thumbnail - Rebuild' command
   nothing happens

Related

• issues
  1.9.5 - browser - thumbnails - issue with thumbnails generation (current post)
  1.9.2 - browser - thumbnails - heif - green stripes on thumbnails
  1.7.2 - browser - thumbnails - issue with embedded thumbnails
  1.4.4 - browser - thumbnails - size slider issues
  - todo -
  1.9.1 - browser - thumbnails - blinking on resizing
  1.9.1 - browser - thumbnails - fix scaling
  - fixed -
  1.8.3 - browser - thumbnails - shadow threshold (1.9.0)
  1.8.2 - general - image scaling - improve consistency (1.9.0)
  1.8.0 - browser - thumbnails - paletted images transparency ignored (1.8.1)
  1.6.4 - browser - thumbnails - cached size affects size (1.6.5)
  1.5.3 - browser - thumbnails - autorotation (1.6.0)
  1.4.0 - browser - thumbnails - incorrect thumbnail for image with different x/y DPI (1.4.4)

• suggestions
  Metadata - EXIF thumbnail - add extract/replace actions
  Settings - thumbnails - overlay icon - add custom positioning
  Browser - thumbnails - overlay icon - split top row icons
  Browser - thumbnails - change size via mouse wheel
  - done -
  Settings - catalog - group thumbnail caching settings | move uom out of control (1.8.7)
  Browser - thumbnails - add custom content anchor in cell (1.8.4)
  Browser - thumbnails - improve default appearance (1.8.3)

[xnview]

Thanks to your detailed description I can reproduce the problem.