gateway-ComfyUI-Kie-API/web/docs/KIE_Flux2_I2I.md

KIE Flux 2 (Image-to-Image)

Generate an image from one or more input images using Flux 2 Pro or Flux 2 Flex.

Inputs

• images (IMAGE, required): Input image batch. 1–8 images supported; all are uploaded.
• prompt (STRING, required): Text prompt (3–5000 characters).
• model (COMBO, required):
  • flux-2/pro-image-to-image
  • flux-2/flex-image-to-image
• aspect_ratio (COMBO, required): 1:1, 4:3, 3:4, 16:9, 9:16, 3:2, 2:3, auto
• resolution (COMBO, required): 1K, 2K
• log (BOOLEAN, optional): Enable console logging.

Outputs

• IMAGE: ComfyUI image tensor (BHWC, float32, 0–1)

Helper behavior

• Validates prompt length and image tensor shape.
• Uploads up to 8 images and passes their URLs in input_urls.
• Polls the task until completion, then downloads and decodes the output image.