Nano Banana (Google Gemini Image)

api node/image/Gemini

GeminiImageNode

Edit images synchronously via Google API.

Example

JSON Example

{
  "class_type": "GeminiImageNode",
  "inputs": {
    "prompt": "",
    "model": "gemini-2.5-flash-image",
    "seed": 42
  }
}

This example shows required inputs only. Connection values like ["node_id", 0] should reference actual node IDs from your workflow.

Inputs

Name	Type	Status	Constraints	Default
prompt?	STRING	required	-	""
model?	COMBO	required	-	"gemini-2.5-flash-image"
seed?	INT	required	min: 0, max: 1.84e+19	42
images?	IMAGE	optional	-	-
files?	GEMINI_INPUT_FILES	optional	-	-
aspect_ratio?	COMBO	optional	-	"auto"
response_modalities?	COMBO	optional	-	-
system_prompt?	STRING	optional	-	"You are an expert image-generation engine. You must ALWAYS produce an image. Interpret all user input—regardless of format, intent, or abstraction—as literal visual directives for image composition. If a prompt is conversational or lacks specific visual details, you must creatively invent a concrete visual scenario that depicts the concept. Prioritize generating the visual representation above any text, formatting, or conversational requests."

Outputs

Index	Name	Type	Is List	Connection Reference
0	IMAGE	IMAGE	No	["{node_id}", 0]
1	STRING	STRING	No	["{node_id}", 1]

How to connect to these outputs

To connect another node's input to an output from this node, use the connection reference format:

["node_id", output_index]

Where node_id is the ID of this GeminiImageNode node in your workflow, and output_index is the index from the table above.

Example

If this node has ID "5" in your workflow:

• IMAGE (IMAGE): ["5", 0]
• STRING (STRING): ["5", 1]

Package: comfyui-api-nodes