RunwayAleph2PromptImageNode - ComfyUI Built-in Node Documentation

Complete documentation for the RunwayAleph2PromptImageNode node in ComfyUI. Learn its inputs, outputs, parameters and usage.

This node anchors a guidance image to a specific moment in the output video, controlling what the edited video looks like at that point. Connect this node to the prompt_images input of the Runway Aleph2 Video to Video node, and chain several together (up to 5) using the optional prompt_images input.

Inputs

Parameter	Description	Data Type	Required	Range
image	The guidance image to place at the chosen moment of the output video.	IMAGE	Yes	-
position	How to place this image on the output video’s timeline. Choose between absolute timing (seconds from start) or fractional timing (percentage of video duration).	COMBO	Yes	Absolute (seconds) Fraction (0.0 to 1.0)
prompt_images	Optional earlier prompt images to chain with this one. Connect the output of another Runway Aleph2 Prompt Image node here to build a chain of up to 5 guidance images.	PROMPT_IMAGE_CHAIN	No	-

Position Mode Details:

When position is set to Absolute (seconds), you must provide a seconds value (default: 0.0, range: 0.0 to 30.0, step: 0.1). This specifies the exact time in seconds from the start of the output video where this image applies.

When position is set to Fraction (0.0 to 1.0), you must provide a fraction value (default: 0.0, range: 0.0 to 1.0, step: 0.01). This specifies where in the output video this image applies as a fraction of its total duration (0.0 = start, 1.0 = end).

Outputs

Output Name	Description	Data Type
prompt_images	A chain of prompt images that can be connected to the prompt_images input of the Runway Aleph2 Video to Video node.	PROMPT_IMAGE_CHAIN

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