shinchven/nano-banana-skills/imax-portrait

{
  "task": "imax-portrait",
  "parameters": {
    "aspect_ratio": "1.43:1",
    "allowed_aspect_ratios": [
      "1.43:1",
      "1.90:1"
    ],
    "output_format": "png",
    "guidance_scale": 7.5
  },
  "input": {
    "image_data": "<USER_UPLOADED_IMAGE_BASE64>",
    "expansion_direction": "all"
  },
  "prompt_construction": {
    "positive_prompt": "IMAX 70mm portrait photography. 1.43:1 aspect ratio. Christopher Nolan style. 80mm lens, f/1.4 aperture. Shallow depth of field. The subject is perfectly centered within the new, taller frame. Ample headroom is added above the subject, ensuring no part of the head is cut off. There is comfortable padding space around the entire character, creating a balanced composition. High fidelity texture.",
    "negative_prompt": "distorted, stretched, low resolution, cropped head, cramped framing, subject too close to edge"
  },
  "agent_instructions": {
    "step_1": "Identify the main character subject and the existing lighting direction within the input image.",
    "step_2": "Create a new, larger canvas at exactly the 1.43:1 aspect ratio.",
    "step_3": "Re-compose the shot by centering the identified subject within this new canvas, ensuring ample breathing room is added above the head and around the sides.",
    "step_4": "Fill the newly created surrounding areas with seamless bokeh and 70mm film grain consistent with the original image's environment."
  }
}