决定性瞬间黑白街头摄影

{
  "generation_request": {
    "meta_data": {
      "tool": "NanoBanana Pro",
      "task_type": "street_photography_decisive_moment",
      "language": "zh",
      "priority": "highest",
      "version": "v1.0_DECISIVE_MOMENT_GEOMETRY_NO_CROP"
    },
    "scene": {
      "location": "[繁华的城市街角]",
      "time_of_day": "[白天]",
      "environment": "仅自然光，无人工照明",
      "activity": "[行人在具有强烈几何感的建筑背景前穿行]",
      "moment_description": "[单一行人在步态运动最高峰踏入画面，与建筑线条完美呼应]"
    },
    "camera_logic": {
      "lens": "[50mm定焦镜头]",
      "aperture": "[f/8]",
      "shutter_speed": "[1/250秒]",
      "iso": "自动",
      "focus_mode": "手动超焦距对焦",
      "focus_distance": "约3米"
    },
    "composition_logic": {
      "approach": "预先构图",
      "geometry_priority": "高",
      "human_subject_role": "服从于几何构图但抓拍时机精准",
      "crop_policy": "无二次裁切，相机内完成完整构图"
    },
    "timing_logic": {
      "capture_rule": "精准抓拍人类行走姿态的高峰瞬间",
      "anticipation_based": true
    },
    "style": {
      "color": "黑白",
      "contrast": "中等",
      "tonality": "自然，胶片质感",
      "mood": "宁静、精确、恒久"
    },
    "negative_prompt": "摆拍人物，人工光源，浅景深，运动模糊，重度后期，电影化夸张，裁切"
  }
}