Character Portrait Relighting

Upload a portrait of your character and create multiple cinematic lighting conditions while maintaining character consistency.

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About

Character Portrait Relighting is a compact ComfyUI workflow that takes a single portrait and renders it under different, cinematic lighting conditions while keeping the character’s identity consistent. It uses three nodes end-to-end: LoadImage to ingest your source portrait, GeminiImage2Node to perform image-to-image relighting through an external API, and SaveImage to write the results. The workflow is configured to run the Nano Banana Pro model inside GeminiImage2Node, which is well-suited for photoreal portrait work.

Technically, the relighting happens by conditioning the generation on your uploaded image plus a text prompt that describes the lighting setup you want (for example: "soft key light from camera-left, warm rim light, low-fill, filmic contrast"). GeminiImage2Node sends the image and prompt to the API, returning a relit image that preserves pose and facial structure based on the input. You can keep identity tight by favoring higher image-to-image preservation (often exposed as a strength or guidance setting).

To produce multiple looks from the same portrait, duplicate GeminiImage2Node (each with a different lighting prompt) and route them all from the same LoadImage, then save each result with its own label via SaveImage.

What you provide

Reading the workflow

Runs in ComfyUI. This workflow can't run on this page. Open it in Comfy Cloud with everything loaded, or download it for your own ComfyUI.

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Output

Use this workflow from code

Generated from the workflow graph and inputs when possible; stored examples are shown otherwise. Review credentials and endpoints before running code, which may incur charges.

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What you need

Runs on: Comfy Cloud
Key: COMFY_API_KEY

Needs a paid Cloud plan and credits.

Download API JSON

# Python 3.10+: pip install comfy-sdk==0.4.0
import os

from comfy_sdk import Comfy

api_key = os.environ.get("COMFY_API_KEY", "").strip()
if not api_key: raise RuntimeError("Set COMFY_API_KEY")
os.environ.setdefault("COMFY_BASE_URL", "https://cloud.comfy.org")
client = Comfy(api_key=api_key)
workflow = client.workflows.from_json({
    "124": {
        "class_type": "LoadImage",
        "inputs": {
            "image": "silver_hand.png"
        },
        "_meta": {
            "title": "Load Image"
        }
    },
    "136": {
        "class_type": "GeminiImage2Node",
        "inputs": {
            "aspect_ratio": "auto",
            "images": [
                "124",
                0
            ],
            "model": "Nano Banana 2 (Gemini 3.1 Flash Image)",
            "prompt": "Maintain the identity of input image 1, modify the shadows to match the following lighting style: dual rim backlight, no front key, twin hard lights from behind left and right, subject silhouetted at center, glowing edge separation on both sides, dramatic dark fill",
            "resolution": "1K",
            "response_modalities": "IMAGE+TEXT",
            "seed": 194380522768098,
            "system_prompt": "You are an expert image-generation engine. You must ALWAYS produce an image.\nInterpret all user input—regardless of format, intent, or abstraction—as literal visual directives for image composition.\nIf a prompt is conversational or lacks specific visual details, you must creatively invent a concrete visual scenario that depicts the concept.\nPrioritize generating the visual representation above any text, formatting, or conversational requests."
        },
        "_meta": {
            "title": "Nano Banana Pro (Google Gemini Image)"
        }
    },
    "138": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "ComfyUI-nb_2",
            "images": [
                "136",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    },
    "150": {
        "class_type": "GeminiImage2Node",
        "inputs": {
            "aspect_ratio": "auto",
            "images": [
                "124",
                0
            ],
            "model": "Nano Banana 2 (Gemini 3.1 Flash Image)",
            "prompt": "Maintain the identity of input image 1, modify the scene lighting and shadows to match the following lighting style: Hard top-down overhead key, harsh light directly above, deep under-eye and jaw shadows, pronounced brow ridge highlight, strong nose shadow pointing straight down, theatrical and sculpted",
            "resolution": "1K",
            "response_modalities": "IMAGE+TEXT",
            "seed": 31312554729959,
            "system_prompt": "You are an expert image-generation engine. You must ALWAYS produce an image.\nInterpret all user input—regardless of format, intent, or abstraction—as literal visual directives for image composition.\nIf a prompt is conversational or lacks specific visual details, you must creatively invent a concrete visual scenario that depicts the concept.\nPrioritize generating the visual representation above any text, formatting, or conversational requests."
        },
        "_meta": {
            "title": "Nano Banana Pro (Google Gemini Image)"
        }
    },
    "152": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "ComfyUI-nb_2",
            "images": [
                "150",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    },
    "156": {
        "class_type": "GeminiImage2Node",
        "inputs": {
            "aspect_ratio": "auto",
            "images": [
                "124",
                0
            ],
            "model": "Nano Banana 2 (Gemini 3.1 Flash Image)",
            "prompt": "Maintain the identity of input image 1, modify the scene lighting and shadows to match the following lighting style: Split lighting, hard side key at 90°, one half face fully lit, other half near-black, sharp nose shadow line, minimal fill.",
            "resolution": "1K",
            "response_modalities": "IMAGE+TEXT",
            "seed": 337125210981716,
            "system_prompt": "You are an expert image-generation engine. You must ALWAYS produce an image.\nInterpret all user input—regardless of format, intent, or abstraction—as literal visual directives for image composition.\nIf a prompt is conversational or lacks specific visual details, you must creatively invent a concrete visual scenario that depicts the concept.\nPrioritize generating the visual representation above any text, formatting, or conversational requests."
        },
        "_meta": {
            "title": "Nano Banana Pro (Google Gemini Image)"
        }
    },
    "158": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "ComfyUI-nb_2",
            "images": [
                "156",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    },
    "168": {
        "class_type": "GeminiImage2Node",
        "inputs": {
            "aspect_ratio": "auto",
            "images": [
                "124",
                0
            ],
            "model": "Nano Banana 2 (Gemini 3.1 Flash Image)",
            "prompt": "Maintain the identity of input image 1, modify the scene lighting and shadows to match the following lighting style: Rembrandt, side key slightly above, deep falloff, subtle rim separation.",
            "resolution": "1K",
            "response_modalities": "IMAGE+TEXT",
            "seed": 95962613515780,
            "system_prompt": "You are an expert image-generation engine. You must ALWAYS produce an image.\nInterpret all user input—regardless of format, intent, or abstraction—as literal visual directives for image composition.\nIf a prompt is conversational or lacks specific visual details, you must creatively invent a concrete visual scenario that depicts the concept.\nPrioritize generating the visual representation above any text, formatting, or conversational requests."
        },
        "_meta": {
            "title": "Nano Banana Pro (Google Gemini Image)"
        }
    },
    "170": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "ComfyUI-nb_2",
            "images": [
                "168",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    },
    "180": {
        "class_type": "GeminiImage2Node",
        "inputs": {
            "aspect_ratio": "auto",
            "images": [
                "124",
                0
            ],
            "model": "Nano Banana 2 (Gemini 3.1 Flash Image)",
            "prompt": "Maintain the identity of input image 1, modify the scene lighting and shadows to match the following lighting style: Motivated practical, off-axis kicker mimicking an environmental source, strong directional spill, naturalistic shadow logic, atmospheric fill.",
            "resolution": "1K",
            "response_modalities": "IMAGE+TEXT",
            "seed": 16095681705317,
            "system_prompt": "You are an expert image-generation engine. You must ALWAYS produce an image.\nInterpret all user input—regardless of format, intent, or abstraction—as literal visual directives for image composition.\nIf a prompt is conversational or lacks specific visual details, you must creatively invent a concrete visual scenario that depicts the concept.\nPrioritize generating the visual representation above any text, formatting, or conversational requests."
        },
        "_meta": {
            "title": "Nano Banana Pro (Google Gemini Image)"
        }
    },
    "181": {
        "class_type": "SaveImage",
        "inputs": {
            "filename_prefix": "ComfyUI-nb_2",
            "images": [
                "180",
                0
            ]
        },
        "_meta": {
            "title": "Save Image"
        }
    }
})

# run() also passes api_key to the partner nodes in this workflow.
job = client.run(workflow, api_key=api_key)

API documentation

Character Portrait Relighting

About

What you provide

Inside the workflow

Requires custom nodes

Use this workflow from code

What you need

Questions & answers

About

What you provide

Inside the workflow

Requires custom nodes

Use this workflow from code

What you need

Questions & answers

How does the workflow keep the character’s identity consistent?

What resolution do I get back?

Do I need a powerful GPU to run this?

Can I relight only parts of the image (e.g., keep background unchanged)?