Try passing Crop: true field in bimg.Options.

So the ar thing (func imageCalculations) is related to cropping?

You don't have to do manual crop calculation unless you explicitly want it. bimg crop calculus is based on a specific width, height or both. If you want to keep the aspect ratio, you should pass only width or height, since the other axis size will be implicitly based on the original image size, so aspect ratio should be maintained.

Is that clear for you? Try running some transformation.

My use case is that I want to use bimg to resize an image to fit in a box of 1024x1024, so if it's wider it would resize to something like 1024x800px and if it is taller to 800x1024px.

Try using Crop: true and Enlarge: true with a specific ´Width´ or ´Height´. If you pass Force: true, the aspect ration won't be maintained.

I'm wondering about this as well. I would like my image to "fit in" a given box. I don't want anything cropped, just resized, preserving the aspect ratio. Resize does what I want if I only pass one dimension, but I want to pass both width and height.

Example: I have an image that is 100x200. I ask for it to "fit in" a box of 100x100. The image I get back should be 50x100.