Imagemagick: Create thumbnail of restricted width, but any height

Question

To create a thumbnail from an image file, you can run the following ImageMagick command: convert -strip -thumbnail 600x600> filename.png.

However, I am in a situation in which I want to limit how wide an image is, but the height is not restricted.

How can I instruct ImageMagick to resize larger images to a specific width, without restricting the height?

Answer 1

I'm not sure if this is what you want, but you can specify just a width to change only images wider than that value:

convert -strip -thumbnail '600x>' filename.png out.png