---
title: saturation
summary: null
url: https://www.fastly.com/documentation/reference/io/saturation
---

Saturation of the output image.

The `saturation` parameter increases or decreases the intensity of the colors in an image.

## Syntax

```text
saturation={value}
```

`value` may be any number between -100 and 100.

## Notes

1. The default value is `0`. This leaves the image unchanged.
2. Valid values range from `-100` to `100`
3. A value of `-100` will generate a grayscale image.

## Examples

Click the links to view the transformed image using a demo Fastly IO service.

| Example usage                                                         | Description                                                |
| --------------------------------------------------------------------- | ---------------------------------------------------------- |
| [`?saturation=25`](https://www.fastly.io/image.jpg?saturation=25)     | Increase saturation by 25                                  |
| [`?saturation=-100`](https://www.fastly.io/image.jpg?saturation=-100) | Decrease saturation by 100 (rendering the image grayscale) |