# Image Aspect Ratio

Let's say you want to place an image in a 3D Scene - on a wall or on a banner or a TV - how do you know what aspect ratio to use?

You can depend on a property of GMetri - that when you first import an image, GMetri maintains its aspect ratio.

There are a few images in GMetri Assets > Images that are essentially grids - you can use grids to find out the aspect ratio of these walls

*These are the good ones:*

<figure><img src="https://media.discordapp.net/attachments/1074714839458512986/1075319122428186665/image.png?width=1265&#x26;height=898" alt=""><figcaption><p>Grid Images</p></figcaption></figure>

## Measuring aspect ratio

The steps to measure the aspect ratio of a wall is to place the grid on the wall (align as closely as possible) and then scale it so one side becomes a whole number

### Example 1

For example here for this wall, we placed and scaled it so that the y height = 10

<figure><img src="https://media.discordapp.net/attachments/1074714839458512986/1075319407141724170/image.png" alt=""><figcaption><p>Determining aspect ratio - Example 1</p></figcaption></figure>

And the corresponding x length happens to be 16.2 (-1 to 15.2) - so you want to use an image with an aspect ratio of 16.2:10 for this wall - something like Eg: `800px x 500px`

### Example 2

<figure><img src="https://media.discordapp.net/attachments/1074714839458512986/1075323851208138792/image.png" alt=""><figcaption><p>Determining aspect ratio - Example 2</p></figcaption></figure>

This ratio happens to be 20:7.4. So you want an image with a resolution like `1000px x 370px`

This is of course only true when you want **exactly 0 distortion**. You can also ballpark it and make minor adjustments to the image element with minor distortion.