dpr

The device pixel ratio is used to easily convert between CSS pixels and device pixels. This makes it possible to display images at the correct pixel density on a variety of devices such as Apple devices with Retina Displays and Android devices. You must specify either a width, a height, or both for this parameter to work. The default is 1. The maximum value that can be set for dpr is 8.

Usage
Request
GET YOUR_APP_URL/api/images/entries/image.jpg?w=250&dpr=2&token=YOUR_IMAGES_TOKEN
Example
Request
GET https://flextype.org/api/images/entries/image.jpg?w=250&dpr=2&token=3b29b31ae05c89c2009f6e3f96e3d703
Result