When Xenforo calls ImageMagick (PECL version, fwiw), it calls the 'thumbnailImage' function instead of resizeImage (or adaptiveResizeImage).
(resizeImage is only used by Xenforo for Scaling Up)
This can be seen in the php file
I noticed that images are not reducing in size even though they are reduced to "maximum" upload width/height.
Do we have any ability in xmg to reduce image sizes or compress the images, not just resolution but also physical disk space the image takes? I downloaded the same...
Some useful info about attachments/fotos in Xenforo:
Where are attachments stored?
If you were used to vBulletin there was a setting if you want to store the attachments in the file system (doesn't stress your database) or in the database (prohibits synchronization problems if you use several...