Blurry thumbnails after migrating from vBulletin

[Kirby]

We recently migrated a vBulletin 4 to XenForo 2.3 and afterwards got some complaints from users that thumbnails are blurry / unsharp (image optimization is not yet turend on).
Compairing thumbnail images between vBulletin and XenForo this indeed seems to be true.

Stepping through the code it looks like vBulletin always applied an unsharp mask on generated thumbnails, XenForo does not do that even though it has a unsharpMask() method but apparently only XFMG uses unsharpMask()...

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Blurry thumbnails after migrating from vBulletin

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