Configuration 

Extension configuration 

Admin Tools > Settings > Extension Configuration > filefix, tab images. Used by the oversized image report and the resize. Invalid or empty values fall back to the defaults (also before the settings were ever saved).

Name Type Default
int 1900
int 1900
imageMaxWidth
Type
int
Default
1900

Maximum image width in px (100–10000).

imageMaxHeight
Type
int
Default
1900

Maximum image height in px (100–10000).

Everything else is fixed on purpose: checked and resizable types (see Oversized images), JPEG quality (from core GFX/jpg_quality), colour profile (always kept), minimum saving (10 KB).