schema.json

{
    "definitions" : {
        "dimensions" : {
            "oneOf": [
                {
                    "type": "string",
                    "pattern": "auto\\b"
                },
                {"type": "number"}
            ]
        },
        "resizing_algorithm": {
            "type": "string",
            "pattern": "(RESIZE_NEAREST_NEIGHBOR\\b|RESIZE_BILINEAR\\b|RESIZE_BICUBIC\\b|RESIZE_HERMITE\\b|RESIZE_BEZIER\\b)"
        },
        "horizontal_alignment": {
            "type": "string",
            "pattern": "(HORIZONTAL_ALIGN_LEFT\\b|HORIZONTAL_ALIGN_CENTER\\b|HORIZONTAL_ALIGN_RIGHT\\b)"
        },
        "vertical_alignment": {
            "type": "string",
            "pattern": "(VERTICAL_ALIGN_TOP\\b|VERTICAL_ALIGN_MIDDLE\\b|VERTICAL_ALIGN_BOTTOM\\b)"
        }
    },
    "properties": {
        "resize" : {
            "type": "object",
            "properties": {
                "width": {
                    "$ref": "#/definitions/dimensions"
                },
                "height": {
                    "$ref": "#/definitions/dimensions"
                },
                "mode": {
                    "$ref": "#/definitions/resizing_algorithm"
                }
            },
            "required" : ["width", "height"]
        },
        "contain": {
            "type": "object",
            "properties" : {
                "width": {
                    "$ref": "#/definitions/dimensions"
                },
                "height": {
                    "$ref": "#/definitions/dimensions"
                },
                "valign": {
                    "$ref": "#/definitions/vertical_alignment"
                },
                "halign": {
                    "$ref": "#/definitions/horizontal_alignment"
                },
                "mode": {
                    "$ref": "#/definitions/resizing_algorithm"
                }
            }
        },
        "cover": {
            "type": "object",
            "properties" : {
                "width": {
                    "$ref": "#/definitions/dimensions"
                },
                "height": {
                    "$ref": "#/definitions/dimensions"
                },
                "valign": {
                    "$ref": "#/definitions/vertical_alignment"
                },
                "halign": {
                    "$ref": "#/definitions/horizontal_alignment"
                },
                "mode": {
                    "$ref": "#/definitions/resizing_algorithm"
                }
            }
        },
        "crop": {
            "type": "object",
            "properties": {
                "x": {
                    "type": "number"
                },
                "y": {
                    "type": "number"
                },
                "width": {
                    "type": "number"
                },
                "height": {
                    "type": "number"
                }
            }
        },
        "opacity": {
            "type": "object",
            "properties": {
                "opacity": {
                    "type": "number",
                    "minumum": 0,
                    "maximum": 1
                }
            }
        },
        "fade": {
            "type": "object",
            "properties": {
                "opacity": {
                    "type": "number",
                    "minumum": 0,
                    "maximum": 1
                }
            }
        },
        "sepia" : {
            "type": "boolean"
        }
    },
    "additionalProperties": false
}