{
  "tool": "OpenAI built-in image generation",
  "imageFile": "metropolis-illustration.png",
  "createdDate": "2026-09-08",
  "revisedDate": "2026-09-08",
  "referenceRole": "Targeted edit of the previous AI illustration; no new period photograph or direct render supplied in this edit",
  "referenceFiles": [
    "metropolis-illustration.png"
  ],
  "derivedFrom": {
    "imageSha256": "c9b2e04c4c6c0ed47997000bbe04d7bfba1148ed0c99f6d97552c4d0f07f1b8b",
    "previousGenerationProvenance": {
      "tool": "Built-in image generation",
      "imageFile": "metropolis-illustration.png",
      "createdDate": "2026-09-08",
      "referenceRole": "Newly authored GLB three-quarter render used as visual reference",
      "referenceFile": "metropolis-model-three-quarter.png",
      "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
      "generationPrompt": "Create one polished, realistic maritime historical reconstruction illustration of Metropolis, Wooden two-mast schooner, Two-mast schooner interpretation, before 1886. Landscape composition, lake visible in background, entire ship and all spars in frame with generous margins. Use the supplied newly-authored 3D render as the structural reference: preserve its hull proportions, number of masts and funnels, working arrangement and ship type. Make it look like a richly detailed physical vessel afloat, not a toy or studio model. Setting: cold overcast November daylight with a few drifting snow flurries, moderate waves; no wrecking scene. Low distant Great Lakes shoreline, believable fresh water, no mountains or modern skyline. Treat this as interpretive artwork, not documentary evidence. No text, lettering, flags, pennants, logos, labels, captions or watermark. No people in distress or disaster. Do not add extra masts, funnels, sails, cargo cranes or decks. Ship length 126 ft, beam 28 ft. Exactly two masts and four fore-and-aft sails, no square sails."
    }
  },
  "historicalStatus": "AI-generated interpretive artwork; not documentary evidence or an exact GLB render",
  "generationPrompt": "Edit the supplied AI interpretive ship illustration with a narrow correction. Remove rust-like orange spots and streaks from the light upper hull. Show lightly weathered painted wooden planking, subtle horizontal seams and grey wear only. Preserve two masts and all deployed sails, snowy lake weather, cabin and composition. Preserve framing, aspect ratio, lighting and all unmentioned details. Keep deck winches as squat transverse rope drums with solid flanges, never barrels. No text, no lettering, no name boards, no guns, no weapons, no cannon, no watermark. No extra masts or floating parts. Do not add modern equipment. This remains an interpretive illustration, not historical photographic evidence.",
  "revisionReason": "Remove rust-like orange spots and streaks from the light upper hull. Show lightly weathered painted wooden planking, subtle horizontal seams and grey wear only. Preserve two masts and all deployed sails, snowy lake weather, cabin and composition.",
  "imageSha256": "091827575f4431dec3d56e3c3808bc392c4d88ecd78e550a9c97d98a5c2f4cc5",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "regenerated",
    "imageSha256": "091827575f4431dec3d56e3c3808bc392c4d88ecd78e550a9c97d98a5c2f4cc5",
    "observations": "Four native-pixel crops inspected. No weapons, garbled lettering, material mismatch, added masts, disconnected fittings or modern equipment observed. Interpretive details and background scenery are not documentary evidence."
  },
  "referenceFile": "metropolis-illustration.png"
}