{
  "tool": "OpenAI built-in image generation",
  "imageFile": "haltiners-barge-illustration.png",
  "createdDate": "2026-09-07",
  "revisedDate": "2026-09-08",
  "referenceRole": "Targeted edit of the previous AI illustration; no new period photograph or direct render supplied in this edit",
  "referenceFiles": [
    "haltiners-barge-illustration.png"
  ],
  "derivedFrom": {
    "imageSha256": "74030c5b6307557e5f829ad937377645870633cf9addfa90f9f9a93d13cec60a",
    "previousGenerationProvenance": {
      "tool": "Built-in image generation",
      "imageFile": "haltiners-barge-illustration.png",
      "createdDate": "2026-09-07",
      "referenceRole": "Newly authored GLB three-quarter render used as visual reference",
      "referenceFile": "haltiners-barge-model-three-quarter.png",
      "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
      "generationPrompt": "Use case: historical-scene. Create a detailed photorealistic-style maritime reconstruction illustration for Michigan Lake Depths. Input image 1 is a reference render of our newly authored interpretive 3D model of Haltiner’s Barge, not a historical photograph. Preserve the vessel's distinctive proportions, mast count, deck structures and rig arrangement. Broad 80 by 33 foot wooden work scow with a single black open lattice steel derrick boom, supporting A-frame and cables, horizontal steam boiler under an open-sided roof, winches and hanging hook. No sails, navigation masts or ship propulsion. Boom angled over the bow. Show the entire vessel including every mast tip and bow projection on calm Lake Huron water, in soft natural daylight with a low distant shoreline. Elevated three-quarter side view, generous framing margins, realistic timber/metal/canvas texture and fine working rigging. Retain the same main arrangement as the model while making the scene convincing. No added ships, people, text overlays, logos or watermark. This is interpretive artwork, not documentary evidence. Historical limitation for context: Wreck evidence establishes a wooden barge, steel crane, boiler and winches. Their working arrangement, crane height and boom angle are inferred from period derrick practice, not a recovered plan. Build date is unknown. NOAA says c. 1929 loss; the tracker says 1927."
    }
  },
  "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. The hull is WOODEN, not metal. Replace the rusty metallic hull sides with tar-darkened wooden planking, subtle horizontal seams and grey weathering. No steel plating or orange corrosion on the hull. Preserve the steel lattice crane, its cables, hook, boiler and winches, timber deck and open shelter exactly. 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": "The hull is WOODEN, not metal. Replace the rusty metallic hull sides with tar-darkened wooden planking, subtle horizontal seams and grey weathering. No steel plating or orange corrosion on the hull. Preserve the steel lattice crane, its cables, hook, boiler and winches, timber deck and open shelter exactly.",
  "imageSha256": "eb211ee8e9de7ac75c4987c5429016952009c74f32704c6babb092c14d2941b1",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "regenerated",
    "imageSha256": "eb211ee8e9de7ac75c4987c5429016952009c74f32704c6babb092c14d2941b1",
    "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": "haltiners-barge-illustration.png"
}