Prepare a Photo Derivative That Omeka S Can Accept
By ImgHeal · Updated
When Omeka S rejects a photo upload, identify the actual format and the site's accepted-media policy first. A compatible viewing derivative may solve the publication need while the original stays in the archive. Renaming a file extension does not convert its contents.
Explore this topic: Troubleshoot photo files
Record the exact rejection and source type
Keep the error message, source filename, size, and known format in a private intake note. Open the source in a suitable trusted viewer to establish that it is readable. Check whether the problem concerns the original upload, thumbnail generation, or browser display after upload; those are different stages. Preserve the original unchanged. A TIFF master may be valuable for your archive even if the public website needs a smaller browser-friendly representation.
Follow policy rather than bypassing it
Omeka S documents allowed media types and the role of the configured thumbnail utility. Ask the responsible site administrator about the approved publication formats and limits. Export a separate derivative through a real image-conversion workflow if that suits the collection's policy. Do not broaden all upload permissions or disguise an extension simply to accept one file. Keep the export dimensions, profile, transparency treatment, and source relationship documented so a technical compatibility choice does not silently become a new master.
Inspect the accepted public file
After the approved derivative uploads, open its public view and a permitted download. Check orientation, color, visible text, and the intended detail level. Confirm the record makes the derivative's role clear and retains a source citation. If thumbnail generation still fails, report that distinct symptom with the relevant configuration details rather than repeatedly converting the photo. A restored ImgHeal image should be checked as another derivative: successful upload proves file acceptance, not historical accuracy or equivalence to the untouched source scan.
Check this workflow
- Keep the rejection stage and message.
- Use an approved real conversion workflow.
- Inspect the public derivative and its source label.
Sources and further reading
- Omeka S: MediaExplains attached files, descriptions, primary media, ordering, thumbnails, and media ownership.
Questions about this restoration task
Can I change .tif to .jpg to satisfy an upload rule?
No. Export an actual JPEG or other approved format from a suitable application, preserving the original TIFF separately.
Continue with a related guide
Try a restoration on a copy of your photo
Keep the original scan. Upload a separate digital copy, review ImgHeal’s generated result, and decide whether it suits your needs.
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