https://bugzilla.wikimedia.org/show_bug.cgi?id=37367

--- Comment #1 from [email protected] 2012-06-13 11:42:12 UTC ---
The jpeg was encoded with progessive.
A work around if to reencode with non progressive setting.

Copying discussion from village pump since the village pump bot will archive
it.


    uploaded a new version of the file with commonist, had the same bug. I also
managed to upload a 38 mb file using commonist while keeping the thumb. Esby
(d) 09:01, 6 June 2012 (UTC)
    to be precise, this file (16 069 × 4 141 - 37,91 MB) has a thumb while this
one (20 000 × 3 963 38,39 MB) does not have any. Esby (d) 09:13, 6 June 2012
(UTC)
    Forgot to mention I had opened a bug on bugzilla [2] Esby (d) 14:05, 6 June
2012 (UTC)

        Usually this occurs with progressive encoded JPEGs. Standard/baseline
encoded JPEGs can be rescaled scanline by scanline, but progressives cannot,
and the standard converter requires enough memory to hold the entire image. Try
resaving it with baseline encoding and similar or slightly higher quality.
Dcoetzee (d) 12:27, 6 June 2012 (UTC)

            Hm, COM:MAXTHUMB has the limit lower than that, at 12.5 Megapixels
or around 3500 x 3500 px. If possible, this should be updated. Rd232 (d) 17:58,
10 June 2012 (UTC)

                Unrelated, we are talking of jpeg, not of png / tiff files etc.
I fixed the issue by reuploading the file saved as non progressive. Esby (d)
13:58, 11 June 2012 (UTC)

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