{
  "name": "Street Bloom TouchDesigner Channel Contract",
  "revision": "v01",
  "canvas": {
    "width": 640,
    "height": 360,
    "pixel_aspect": 1.0
  },
  "timebase": {
    "fps": 15,
    "frames": 180,
    "duration_seconds": 12.0,
    "start_frame": 0,
    "end_frame": 179,
    "loop": true,
    "index_expression": "int(absTime.seconds * 15) % 180"
  },
  "data_rules": {
    "encoding": "8-bit grayscale PNG",
    "range": "0-255 maps to 0.0-1.0",
    "color_space": "linear data; do not apply display color correction",
    "alignment": "all channels share identical dimensions, origin, frame count, and timing"
  },
  "channels": {
    "crack": {
      "pattern": "masks/crack/street-bloom_crack_f####.png",
      "role": "fine fissure and darkening control",
      "suggested_operator": "Multiply TOP / darken"
    },
    "chrome": {
      "pattern": "masks/chrome/street-bloom_chrome_f####.png",
      "role": "reflective material reveal and specular control",
      "suggested_operator": "Level TOP into Screen/Add composite"
    },
    "membrane": {
      "pattern": "masks/membrane/street-bloom_membrane_f####.png",
      "role": "wet translucent chartreuse pocket control",
      "suggested_operator": "Ramp TOP into Over/Screen composite"
    },
    "internal-light": {
      "pattern": "masks/internal-light/street-bloom_internal_light_f####.png",
      "role": "broad internal amber-chartreuse emission",
      "suggested_operator": "Blur TOP into Add composite"
    },
    "residue": {
      "pattern": "masks/residue/street-bloom_residue_f####.png",
      "role": "warm oily collapse scar",
      "suggested_operator": "Ramp TOP into Multiply/Over composite"
    }
  },
  "endpoint_seam": {
    "crack": {
      "max_abs_difference": 0.0,
      "mean_abs_difference": 0.0
    },
    "chrome": {
      "max_abs_difference": 0.0,
      "mean_abs_difference": 0.0
    },
    "membrane": {
      "max_abs_difference": 0.0,
      "mean_abs_difference": 0.0
    },
    "internal-light": {
      "max_abs_difference": 0.0,
      "mean_abs_difference": 0.0
    },
    "residue": {
      "max_abs_difference": 1.1114657062019541e-20,
      "mean_abs_difference": 1.1627432787206111e-21
    }
  },
  "note": "Recorded August 26, 2026. This describes the source PNG sequences; the website videos are viewing copies."
}