{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "number",
  "oneOf": [
    {
      "type": "number",
      "description": "normal",
      "enum": [ 0]
    },
    {
      "type": "number",
      "description": "alpha",
      "enum": [ 1]
    },
    {
      "type": "number",
      "description": "invertedAlpha",
      "enum": [ 2]
    },
    {
      "type": "number",
      "description": "luma",
      "enum": [ 3]
    },
    {
      "type": "number",
      "description": "invertedLuma",
      "enum": [ 4]
    }
  ],
  "default": 0
}