How to crop images in OpenCart without white margins?

Use a ready-made modifier from DEV, which crops images without borders.

After installing the module you get:

1. Photos of products without white fields;
2. An image with actual content that is cropped to the shorter side.

Please note that the modifier makes significant adjustments to the file: catalog/model/tool/image.php, so make a copy of it before installation (if possible).