oppose_background.js

{
    "application_id":"YOUR_APP_ID",
    "src" : "https://upload.wikimedia.org/wikipedia/commons/thumb/0/07/UNESCO_logo_white.png/744px-UNESCO_logo_white.png",
    "v" : 1.20,
    "extended_metadata" : true,
    "functions" : [
    {
        "name":"resize_to_fit",
        "params":{
            "width":"400",
            "height":"1000",
            "only_resize_larger" : true
        },
        "save" : {
            "if_alpha" : "oppose_background",
            "image_identifier" : "my_image_0",
            "save_metadata" : true,
            "save_profiles" : true,

            "extension" : "jpg",
            "quality" : 90
        }

    }
    ]
}