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You may install Powerkit from the list of recommended plugins in Appearance → Install Plugins or from the common plugins page in Plugins → Install Plugins.
Make your images ultra-crisp on Retina screens with the Retina Images module integrated in Powerkit.
The module will fetch all registered image thumbnail sizes in Astia and plugins and will register doubled image sizes to support Retina desktops and mobile devices.
To enable Retina Images on your website simply enable the Retina Images module on the Powerkit settings page. Being an advanced module, it’s disabled by default.
You may selectively enable Retina images for certain image sizes in Settings → Media → Retina Images.