INFO
Browser tab of XnViewMP may display cached/live thumbnails from different sources (image/embedded thumbnail) with few quality adjustments, depending on the following settings:
1. Thumbnail source
1.1. live/cache
- is Catalog and Thumbnails caching enabled (Settings > Catalog)
☑ will be generated from file when folder is opened for the first time (WxH and compression set in Settings > Catalog)
☐ will be generated from file each time folder is opened
- is Use embedded thumbnails enabled (Settings > Thumbnails)
☑ • does image have embedded thumbnail
☑ • is Create from original image if embedded thumbnail is smaller than thumbnail size enabled (Settings > Thumbnails)
when this setting is in use related overlay icon will disappear from image
☑ • is embedded thumb size > thumb rendering size (Browser > View > Thumbnails size)
☑ embedded thumb will be used
☐ will be generated from image
☐ will be generated from image
☐ will be generated from image
☐ will be generated from image
2. Thumbnail rendering
2.1. rendering size (Browser > View > Thumbnails size)
- is image/embedded thumb size > thumb rendering size
☑ source will be shrunk to rendered size
☐ source will have original size
- Create high quality thumbnail (bilinear filter)
- Use alpha
- Use sharpen
- Use gamma correction
Thumbnails can be rebuild/deleted manually:
- rebuilding
- embedded
- selected files via EXIF thumbnail - Rebuild (Browser > Metadata > EXIF thumbnail)
- live
- selected files via Rebuild thumbnails (Browser > View)
- cached
- selected files via Rebuild thumbnails (Browser > View)
- all files via Rebuild thumbnails (Settings > Catalog)
- embedded
- deleting
- embedded
- selected files via EXIF thumbnail - Rebuild (Browser > Metadata > Clean)
- cached
- per folder via Delete/Delete all (Settings > Catalog)
- all files via Purge all thumbnails (Settings > Catalog > Maintenance)
- embedded
USE CASE
You increased thumbnail size in Browser from default 128x96, and thumbnails became blurry.
Fix depends on the thumbnail caching settings
- ☑ Thumbnail caching (default)
1. go to Settings > Catalog
- press 'Get thumbnail size' button to increase cached size (192x144 by default) to match rendering size
- press 'Rebuild thumbnails' button
2. reopen Browser tab or restart app
- ☐ Thumbnail caching
1. go to Settings > Thumbnail
- check 'Create from original image if embedded thumbnail is smaller than thumbnail [rendering] size'
- press OK
OR
1. delete embedded thumbnails (JPEG only)
- select files
- select EXIF Thumbnail in Browser > Metadata > Clean..
- press OK
Related
- general
Why are the thumbnails blur?