{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://www.imatest.com/schema/25-1/common-settings-channel-luminance-type-enum",
  "title": "Luminance Channel Standards",
  "description": "The user-provided method for extracting a luminance channel from RGB images.",
  "type": "string",
  "enum": [
    "IEC 61966-2-1",
    "ITU-R BT.601-7",
    "ITU-R BT.709-6",
    "ITU-R BT.2020-2",
    "ITU-R BT.709-1",
    "NTSC (Rounded)",
    "MATLAB",
    "Custom RGB Weights"
  ]
}