This module will resize uploaded images to be below the set dimensions. It is not an image style or other presentation layer module. If you want to maintain the original image you should use Image Resize Filter or an image style. The use case for this module is sites where users may upload very large images, but you do not want/need to keep the original.
This is different from the core image field size restrictions in that it will work on already uploaded files and imported content.
Related
These modules will allow you to adjust the size of the displayed image while leaving the original untouched:
Usage
Simply enable the module and it will begin resizing images when they are uploaded. It will scan for images above the configured dimensions once a day and queue them to be resized.
By default this module will resize images to be under 2560x1600. If you want to change the dimensions it uses then you will need to update the module's configuration. You can do this either through the interface, or by editing your settings.php and setting the following:
<?php
$conf['max_image_size_width'] = 2560;
$conf['max_image_size_height'] = 1600;
?>
Drush
There are two drush commands available:
drush misq: Queue images to process.
drush misp: Process images.
You can get more help and information by typing drush help <command>.