blitline convert command / color matrix

gistfile1.txt

{
    "application_id":"your app id",
    "src":"http://cdn.blitline.com/filters/boys.jpeg",
    "functions":[
        {
            "name":"convert_command",
            "params":{
                "-color-matrix" : "0.5 0 0 0 1 0 0 0 1"
            },
            "save":{
                "image_identifier":"some_id"
            }
        }
        ]
}