Rmagick resize with just a width

Question

Using mogrify, you can use the resize function just passing a width:

Width given, height automagically selected to preserve aspect ratio.

I am trying to find the same option with Rmagick, but it seems that the resize method expects both width and height to be provided.

Any ideas?

Answer 1

Quoting the documentation:

Use the change_geometry method to resize an image with constraints such as "maintain the current proportions."

Try this, for example, where you want the new width to be 400px:

image = image.change_geometry("400") {|cols, rows, img| img.resize!(cols, rows)}