Pick a custom image resolution

To set the image resolution (or pixel density) of an artboard, use the export feature in Sketch.

1. In Sketch, select the artboard.
2. Click Make Exportable in the Inspector panel to open the Presets panel.
   
   
   
   
3. Choose the desired size setting (ex. 2x).
   
   
    

The settings will be applied when the artboard is imported to Gallery.