黑白街头摄影：决定性瞬间

{
  "generation_request": {
    "meta_data": {
      "tool": "NanoBanana Pro",
      "task_type": "street_photography_decisive_moment",
      "language": "en",
      "priority": "highest",
      "version": "v1.0_DECISIVE_MOMENT_GEOMETRY_NO_CROP"
    },

    "scene": {
      "location": "busy urban street corner",
      "time_of_day": "daytime",
      "environment": "natural light only, no artificial lighting",
      "activity": "pedestrians walking through a geometrically strong background",
      "moment_description": "a single pedestrian enters the frame at the exact peak of motion, perfectly aligned with architectural lines"
    },

    "camera_logic": {
      "lens": "50mm prime",
      "aperture": "f/8",
      "shutter_speed": "1/250",
      "iso": "auto",
      "focus_mode": "manual zone focusing",
      "focus_distance": "approximately 3 meters"
    },

    "composition_logic": {
      "approach": "pre-framed composition",
      "geometry_priority": "high",
      "human_subject_role": "secondary to composition but perfectly timed",
      "crop_policy": "no crop, frame must be complete in-camera"
    },

    "timing_logic": {
      "capture_rule": "capture only at the peak of human motion",
      "burst_mode": "minimal, 1-2 frames max",
      "anticipation_based": true
    },

    "style": {
      "color": "black and white",
      "contrast": "medium",
      "tonality": "natural, film-like",
      "mood": "quiet, precise, timeless"
    },

    "negative_prompt": "posed subjects, artificial lighting, shallow depth of field, dramatic blur, heavy post-processing, cinematic exaggeration, crop, zoom lens look"
  }
}