Preserve crop aspect if image is smaller than crop size

preserve_apect_if_smaller.json

{
    "application_id":"YOUR_APP_ID",
    "src":"http://placekitten.com/300/100",
    "functions":[
        {
            "name":"crop",
            "params":{
                "width":500,
                "height":500,
                "gravity" : "CenterGravity",
                "preserve_aspect_if_smaller": true 
           },
            "save":{
                "image_identifier":"MY_CLIENT_ID"
            }
        }
    ]
}