> ## Documentation Index
> Fetch the complete documentation index at: https://docs.melius.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Aspect ratios, durations, and resolutions

> Output-shape settings per node.

Generative nodes expose shape settings that get passed to the underlying model.

## Aspect ratios

Supported aspect ratios across image and video models:

`21:9` · `16:9` · `4:3` · `3:2` · `1:1` · `2:3` · `3:4` · `9:16` · `9:21`

Not every model supports every ratio. The node UI hides ratios the selected model can't produce.

## Image resolutions

| Tier   | Notes                                    |
| ------ | ---------------------------------------- |
| `0.5K` | Fastest, lowest cost.                    |
| `1K`   | Default for most image models.           |
| `2K`   | High detail.                             |
| `4K`   | Highest tier. Slower and more expensive. |

## Video resolutions

| Tier    | Notes                             |
| ------- | --------------------------------- |
| `720p`  | Fastest, lowest cost.             |
| `1080p` | Default.                          |
| `4k`    | Highest tier on supported models. |

## Durations

Video nodes accept a clip duration in seconds, bounded by what the chosen model supports. Each video model has its own min/max — the node UI clamps your selection to that range.