How do I make node_gallery image thumbnails retain original proportions? When I upload an image to a Drupal 7 node_gallery gallery, a thumbnail is automatically generated. This is good.

However, the thumbnail is also cropped to a square size. This is bad. (But note that the full-sized image is not cropped.)

I want the thumbnail to retain the original image proportions (often 2:3 or 3:4), the same as the full-sized image (just smaller), rather than being cropped to a 1:1 format.

How can I do that? Google was distinctly unhelpful in this case, showing me results only for old versions of Drupal, and even then those solutions were mostly for other problems.
Never used this module, but try checking /admin/config/media/image-styles perhaps the module has an image style. If so, all you have to do is edit it and change it to your liking.

Side Note: You can also get there by clicking configuration, then under media click on Image Styles. 

As you wrote in a comment:


  Editing the node_gallery_thumbnail style to replace the "Scale and crop" effect with a "Scale" with the same numbers for width and height did the trick.