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Maniphest T108494

small grey line artifacts on large png (probably VIPS non-integral scale related)
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Description

https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Mansur-2.png/999px-Mansur-2.png
and https://upload.wikimedia.org/wikipedia/commons/thumb/6/6e/Mansur-2.png/1000px-Mansur-2.png

Have very faint grey lines.

A similar issue was observed when using vips shrink to scale tiff files by non-integral factors (But I believe pngs used to be fine).

https://commons.wikimedia.org/w/index.php?title=Commons:Village_pump&oldid=168011781#Very_large_PNG_thumbnails_getting_black_lines_in_them

Event Timeline

Bawolff created this task.Aug 8 2015, 10:16 PM
Bawolff raised the priority of this task from to Needs Triage.
Bawolff updated the task description. (Show Details)
Bawolff added projects: Multimedia, MediaWiki-extensions-VipsScaler.
Bawolff subscribed.
Restricted Application added subscribers: Matanya, Aklapper. · View Herald TranscriptAug 8 2015, 10:16 PM
McZusatz subscribed.Aug 9 2015, 11:44 AM

Archive of the linked thumbs:

999px-Mansur-2.png (1×999 px, 2 MB)

1000px-Mansur-2.png (1×1 px, 2 MB)

McZusatz closed this task as a duplicate of T71155: PNG thumbnail get smudgy and streaky (near garbled).Aug 9 2015, 1:13 PM
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