{
  "browser": "156.0.8078.80",
  "algorithm": "app.js current production; Clean Outline",
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    "dimensions": "640x480",
    "coloredRegions": "RGB(200,0,0) and RGB(0,102,0)",
    "computedLuma": "approximately 59.8 and 59.9 on 0-255 scale",
    "control": "both halves RGB(60,60,60)"
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  "outputMaskTest": "Count RGB pixels <150 in central 2% seam band over normalized y range 100..230 in actual generated PNG",
  "rows": [
    {
      "name": "equalLuminanceColor",
      "width": 3508,
      "height": 2480,
      "seamDarkPixels": 12400,
      "dimensions": "A4 · 3508 × 2480 px",
      "bytes": 180917,
      "sha256": "c26b61f820a4002b0e17fa69d95ecb9624057d6f7baf48fbc29ad04713df0b4a"
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    {
      "name": "grayscaleControl",
      "width": 3508,
      "height": 2480,
      "seamDarkPixels": 0,
      "dimensions": "A4 · 3508 × 2480 px",
      "bytes": 180164,
      "sha256": "1c416f544f12c956a679ab8a3bb01506ca6185c88cab615dda9bcbcdf6fa9e49"
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}