Automatically scale down the original image if it's too large. For example, if it's 1600x1200 and you don't want the full size image that large, this module will scale it down.
Limits the size of the image to 1024 (default) pixels on a side. This can be configured using the Advanced setting section.
This module may be downloaded from the Codex here.
To install, extract the "max_size" folder from the zip file into your Gallery 3 modules folder.
Afterwards log into your Gallery web site as an administrator and activate the module in the Admin -> Modules menu.