常用image crop相关模块
https://www.drupal.org/project/crop
https://www.drupal.org/project/focal_point
https://www.drupal.org/project/imagefield_crop
https://www.drupal.org/project/imagecrop
https://www.ostraining.com/blog/drupal/image-widget-crop-module/
https://www.drupal.org/project/manualcrop
经过对比,Drupal7下选择: