Image dimensions

The Image Dimensions module provides an image effect to output images at 100% width.

Add the image effect to any image style. This is useful for when you want to create multiple image styles that are output at 100% width (such as standard resolution and retina images).

Unlike the Media: Responsive module, you can create image styles that take advantage of other image effects (such as cropping an image or sizing it down for page load speed) and still create full width images. Often used for making responsive images in a fluid layout.