On the Responsive image mappings admin page /admin/config/media/responsive-image-style click Add responsive image style to create a new style.
Defining responsive image styles By creating responsive image mappings you define the image styles that are being used to output images at certain breakpoints. These modules are available as Drupal 8 core modules. Usage Prerequisites Make sure both Breakpoint and Responsive image modules are enabled. To get images in IE 8 that aren't mobile sized, you'll need to configure the fallback in your display to use your desktop image size rather than 'automatic'. Responsive image includes a fallback support for Internet Explorer 8. The Responsive Image module in Drupal 8 and later versions provides an image formatter and breakpoint mappings to output responsive images using the HTML5 picture tag. Responsive image sizes get processed by a site editor, whereas fluid gets processed by a browser. Ok, for the discerning reader, an image is an image, whereas the words responsive and fluid describe the processing of that image. Then css fluid image adjusts the image to fit the exact device size to make it look good. Only one of these stored images (the roughly right size one) gets transmitted to the device.
But they could store two, three and maybe even four sizes of each image. Because of the large number of screen sizes, site editors can't possibly store all screen size variations. Use both, responsive images and fluid image css. Also consider the cost of data on the site visitor, who might not visit again because of that cost. As you can imagine, sending a 100 kb fluid image takes far longer than a 1 megabyte responsive image, especially over slow cellular signals. Whereas fluid transmits one size, perhaps the largest size, then forces the device to scale it down. Responsive images transmit less data than fluid images by sending the smallest image necessary for the receiving device. This is different than fluid images when large images are scaled down with CSS. This practice makes websites load faster on mobile devices because image sizes are optimized for mobile devices. Using responsive images means loading images that have been specifically sized for the user screen based on breakpoints. Note: This page could use some more information!
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