Example Blitline pre_process job.

example_pre_process.json

{
    "application_id":"YOUR_APP_ID",
    "src":"https://s3.amazonaws.com/bltemp/boys640.jpg",
    "pre_process":[
        {
            "job":{
                "src":"https://s3.amazonaws.com/img.blitline/mask3.png",
                "functions":[
                    {
                        "name":"rotate",
                        "params":{
                            "amount":25
                        },
                        "functions":[
                            {
                                "name":"resize_to_fit",
                                "params":{
                                    "width":640
                                },
                                "save":{
                                    "image_identifier":"MY_CLIENT_ID"
                                }
                            }
                        ]
                    }
                ]
            }
        }
    ],
    "functions":[
        {
            "name":"composite",
            "params":{
                "gravity":"CenterGravity",
                "src":"&MY_CLIENT_ID",
                "composite_op":"CopyOpacityCompositeOp",
                "as_mask":"true"
            },
            "save":{
                "image_identifier":"output"
            }
        }
    ]
}