{
    "directory": {
        "default": " ", 
        "type": "filechooser", 
        "description" : "Folder",
        "allow-none" : false,
        "select-dir" : true
    },
    "shuffle": {
        "default": true,
        "description": "Shuffle",
        "type" : "switch"
    },
    "delay": {
        "default": 5,
        "type": "spinbutton",
        "min": 1,
        "max": 3600,
        "description" : "Delay",
        "units" : "seconds",
        "step": 1
    },
    "height": {
        "default": 200,
        "type": "spinbutton",
        "min": 50,
        "max": 1600,
        "description" : "Height",
        "units" : "pixels",
        "step": 50
    },
    "width": {
        "default": 300,
        "type": "spinbutton",
        "min": 50,
        "max": 1600,
        "description" : "Width",
        "units" : "pixels",
        "step": 50
    },
    "fade-delay": {
        "default": 0.3,
        "type": "spinbutton",
        "min": 0.0,
        "max": 10.0,
        "description" : "Fade delay",
        "step": 0.1,
        "units": "seconds"
    },
    "effect": {
        "type": "combobox",
        "description": "Special effect",
        "default": "",
        "options": {
            "None": "",
            "Sepia": "sepia",
            "Black and White": "black-and-white"
        }
    }
}