{
  "tool": "OpenAI built-in image generation",
  "imageFile": "selvick-illustration.png",
  "createdDate": "2026-09-06",
  "revisedDate": "2026-09-08",
  "referenceRole": "Targeted edit of the previous AI illustration; no new period photograph or direct render supplied in this edit",
  "referenceFiles": [
    "selvick-illustration.png"
  ],
  "derivedFrom": {
    "imageSha256": "d0381ca77db50dc4b4c514efd5fc6258820b73152202a12519944618649ec1cf",
    "previousGenerationProvenance": {
      "tool": "Built-in image generation",
      "imageFile": "selvick-illustration.png",
      "createdDate": "2026-09-06",
      "createdDateBasis": "date the illustration entered the repository; it was generated with the package, shortly before",
      "referenceRole": "Delivered model three-quarter render as the structural reference; an afloat photograph credited to the Frederick Stonehouse Collection (exploringthenorth.com) as a research reference, not redistributed",
      "referenceFile": "selvick-model-three-quarter.png",
      "referenceUrl": "https://exploringthenorth.com/scuba/selvik.html",
      "historicalStatus": "Supplemental interpretive artwork, not documentary evidence or an exact GLB render",
      "promptSource": "image-generation-prompt.txt",
      "generationPrompt": "Mode: built-in image_gen. One generation, no CLI/API fallback.\nOutput: selvick-illustration.png, a supplemental AI illustration, not a direct GLB render.\nReference 1: selvick-model-three-quarter.png, actual delivered model render.\nReference 2: afloat photograph from https://exploringthenorth.com/scuba/selvik.html, credited to the Frederick Stonehouse Collection. Used as a research reference; not redistributed in this package.\n\nUse case: historical-scene. Create a high-detail photorealistic 3D-style maritime reconstruction illustration of the intact working steel tug STEVEN M. SELVICK on Lake Superior in its late diesel era, roughly before retirement in the early 1990s. Image 1 is our independent 3D reconstruction: preserve its exact overall layout, proportions and three-quarter bow angle. Image 2 is the historical afloat reference showing actual funnel, deckhouse and light derrick arrangement; use it as supplementary evidence only, do not depict the sinking. Hull nominal length70 ft, beam17 ft. Bow left, stern right, all equipment fully in frame. Dark charcoal steel hull with gentle sheer, red oxide underwater portion mostly submerged, low open aft towing deck, dark lower long rounded-front deckhouse, small raised white curved-front pilothouse with rectangular glazing, ONE wide black raked funnel directly aft of wheelhouse, two cream curved cowl ventilators, a SHORT light service derrick reaching over aft deck. No sails. Small navigation mast and restrained late-service fittings, round portholes, slim railings, simple towing hook and towing arches, bitts, capstans, neatly coiled ropes, rubber tire side fenders and heavy rope bow fender. Funnel has simple white SM above T initials; hull/deckhouse name reads STEVEN M. SELVICK if included. Keep a compact 70-foot working tug silhouette, no yacht styling, no extra decks, no massive crane. Natural slightly worn steel, subtle paint aging, realistic rope fibers, clear glazing and fine mechanical fittings; serviceable and afloat, not wrecked or corroded like the current underwater remains. Deep blue-green freshwater with a modest bow ripple and restrained wake. Forested Grand Island shore in distance, soft northern daylight, natural maritime atmosphere, professionally lit museum reconstruction quality. The tug dominates the composition. All colors, small fittings and geographic scenery are interpretive. Do not include crowds, modern skyscrapers, multiple funnels, giant masts, military armament or contemporary yacht electronics. No captions, no watermark, no diagram panels."
    }
  },
  "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 ALL lettering from the cabin sides and funnel, including STEVEN M. SELVICK and the white SM and smaller marks. Replace letters with plain black paint following the surfaces. Preserve the steel tug, pilothouse windows, radar, horns, tires, rope fender, lifering, lifeboat gear, colors, water and scenery. This is a modern-era tug; its existing navigation equipment is intentional. 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 ALL lettering from the cabin sides and funnel, including STEVEN M. SELVICK and the white SM and smaller marks. Replace letters with plain black paint following the surfaces. Preserve the steel tug, pilothouse windows, radar, horns, tires, rope fender, lifering, lifeboat gear, colors, water and scenery. This is a modern-era tug; its existing navigation equipment is intentional.",
  "imageSha256": "49dc9e4ca7c5814d6b2da80231719366da1e1d1c4bd4fb6bc86f3d2c91b36d13",
  "artefactCheck": {
    "date": "2026-09-08",
    "crops": [
      "bow",
      "midships",
      "stern",
      "rig-superstructure"
    ],
    "nativePixelInspection": true,
    "result": "regenerated",
    "imageSha256": "49dc9e4ca7c5814d6b2da80231719366da1e1d1c4bd4fb6bc86f3d2c91b36d13",
    "observations": "Four native-pixel crops inspected. Lettering removed; no weapons, material mismatch, extra masts or floating fittings observed. Modern navigation fittings and tire fenders are intentional for the selected late diesel-era appearance."
  },
  "referenceFile": "selvick-illustration.png"
}