Thumbnail: Crop Question

Is it possible to pass two size dimension in the crop method? I’d like to generate 2 image, one for normal size and one for retina. Also how do I configure the name of the created thumbnails?

To generate two different sizes, you need to create two thumbnails by calling crop twice. Please note that crop always creates copies of the file, so you can call it with different params as often as you need.

Regarding the filename: See this section in the docs.