Diagnose an Omeka S Thumbnail That Does Not Follow New Photo Media
By ImgHeal · Updated
An Omeka S thumbnail can be explicitly assigned and therefore remain unchanged when media are reordered or replaced. Inspect the thumbnail source before uploading the same photograph repeatedly. Diagnose the display choice separately from the media files and their preservation copies.
Explore this topic: Troubleshoot photo files
Compare the displayed image with attached media
Open the item, list its attached files, and identify which image appears in the browse card. Check whether the displayed thumbnail is one of those media or a separate logo, icon, or earlier crop. Record the current configuration before changing anything. Confirm that the expected source file opens at useful detail. If the file itself is wrong, correct the media selection or source workflow rather than treating the problem as a thumbnail override.
Inspect explicit thumbnail configuration
The Omeka S media manual explains automatically generated thumbnails, primary media, and manually selected thumbnail assets. Review the item's relevant advanced configuration through the documented workflow. An explicit asset can override a media-derived thumbnail. Ask the responsible editor to choose whether that override should remain. Do not delete original media or source files to force a display change. Keep the distinction between a publication thumbnail asset and a historical photograph clear in the inventory.
Check the public views that use the item
Review the item's browse card, its page, and an exhibit block after the intended configuration is saved. A theme or block may present the image differently, so inspect the actual recipient route. Confirm that a restored or colorized preview is labeled appropriately when it is used as the leading representation. Retain the unedited scan even if the public thumbnail favors a clearer viewing version. Document the chosen override so a future media update does not recreate the same confusion or produce unnecessary duplicate uploads.
Check this workflow
- Identify the actual image supplying the thumbnail.
- Inspect a manual asset override.
- Check each public presentation using the item.
Sources and further reading
- Omeka S: MediaExplains attached files, descriptions, primary media, ordering, thumbnails, and media ownership.
Questions about this restoration task
Will reordering media always replace a custom thumbnail?
No. A manually assigned thumbnail may override the normal media-derived choice. Inspect that assignment directly.
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