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Maniphest T87236

TIFF thumbnailing fails and page count is wrong
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Description

I recently uploaded some tiff files from the National Library of Sweden. They are all quite big but display properly as one-page TIFFs in both Gimp an ImageMagick (display) on my Ubuntu machine.

Upon uploading them to Commons they are however interpreted as two-page files and the generated thumbnails are entirely (or almost entirely) white. I've had the two-page issue before with tiffs from another source but the white thumbnails are new.

The files can be found at Category:Maps digitised by the National Library of Sweden

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Event Timeline

Lokal_Profil created this task.Jan 20 2015, 3:35 PM
Lokal_Profil raised the priority of this task from to Needs Triage.
Lokal_Profil updated the task description. (Show Details)
Lokal_Profil added a project: Multimedia.
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Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJan 20 2015, 3:35 PM
Bawolff subscribed.Jan 20 2015, 3:38 PM

We have a bug with tiff files that have 16 bit colour channels when > 50 mp which sounds likexwhat you describe

Lokal_Profil added a comment.Jan 20 2015, 4:28 PM

Ah, thanks. Is this the same as T54045 or is there another ticket?

Will create thumbnails manually then and tag with {{LargeTIFF}}.

Bawolff added a comment.Jan 20 2015, 4:32 PM

Its the same as T54045#546265 (Arguably though, that comment should be broken out into a separate bug).

btw, to tell if its that bug, or something else, on the exif section of the image page, under extended details, if the bits per component reads 16, then its this issue.

Lokal_Profil added a comment.Jan 20 2015, 4:34 PM

Thanks for the tip. Is the two-page issue also created by the same bug?

Lokal_Profil added a comment.Jan 20 2015, 4:38 PM

Btw. I assume simply running convert x.tif y.png should give me something which should thumbnail correctly, or will there be a similar issue with the png?

Bawolff added a comment.Jan 20 2015, 4:40 PM
In T87236#986714, @Lokal_Profil wrote:

Thanks for the tip. Is the two-page issue also created by the same bug?

I'm not sure what the cause of the two page thing is, but its unrelated. Maybe a bug in tiffinfo. Its probably a "thumbnail" image being picked up as an extra page.

In T87236#986720, @Lokal_Profil wrote:

Btw. I assume simply running convert x.tif y.png should give me something which should thumbnail correctly, or will there be a similar issue with the png?

That should be fine.

Lokal_Profil closed this task as a duplicate of T54045: Use VipsScaler to scale TIFFs.Jan 21 2015, 9:13 AM
Lokal_Profil mentioned this in T87318: TIFF images acquiring an extra page.Jan 21 2015, 12:21 PM

two-page issue broken out T87318

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