Shot by Image - Automatic Aspect Ratio

ShotByImageAutomaticAspectRatio (shown as Shot by Image - Automatic Aspect Ratio) is the aspect-ratio-flavored member of the automatic shot family. Everything about ShotByImageAutomatic applies - product photo plus reference image, model composes the scene freely - but instead of specifying the output canvas as pixel dimensions (shot_size), you pick an aspect_ratio and the model fills that shape. One output instead of seven, because this variant is built for delivering a finished shot at a known ratio, not a spread of candidates.

Reach for it when you know the target format before you generate: a 9:16 for social, 16:9 for a hero banner, 1:1 for a marketplace listing. You skip the "generate, then crop" step, and because the scene is generated directly into the ratio, nothing important gets cut off in the crop.

How it works

Inputs: image (product), ref_image (scene reference), and aspect_ratio - the usual nine options (1:1, 2:3, 3:2, 3:4, 4:3, 4:5, 5:4, 9:16, 16:9), default 1:1. It calls Bria's /v1/product/lifestyle_shot_by_image endpoint with the automatic_aspect_ratio placement type, and the shared controls carry over: enhance_ref_image (default true), ref_image_influence (0–1, default 1.0), force_rmbg, content_moderation. One output: output_image.

Installing it

Part of the BRIA AI API nodes pack (Bria-AI/ComfyUI-BRIA-API). ComfyUI Manager → search BRIA API → install, or:

cd ComfyUI/custom_nodes
git clone https://github.com/Bria-AI/ComfyUI-BRIA-API

Restart ComfyUI; it's under API Nodes. No models, no GPU - cloud call needing a BRIA API token from platform.bria.ai, billed per generation.

Practical notes

The tradeoff is obvious once you use it: you get exactly one shot at the ratio, so if the composition comes out wrong you're paying for another call. The Automatic seven-candidate node is a better fit when you're still deciding; this one is for when the format is decided and you need a delivered asset. Keep the reference image's own framing in mind - an ultrawide scene reference asked to fill a 9:16 canvas can produce awkward cropping on the product. If that keeps happening, drop to Manual Placement and pin the product yourself.