# System Settings

On the system settings page, the administrator can manage global settings for the Immich instance.

:::note
Viewing and modifying the system settings is restricted to the Administrator.
:::

:::tip
You can always return to the default settings by clicking the `Reset to default` button.
:::

## Job Settings

Using these settings, you can determine the amount of work that will run concurrently for each task in microservices. Some tasks can be set to higher values on computers with powerful hardware and storage with good I/O capabilities.

With higher concurrency, the host will work on more assets in parallel,
this advice improves throughput, not latency, for example, it will make Smart Search jobs process more quickly, but it won't make searching faster.

It is important to remember that jobs like Smart Search, Face Detection, Facial Recognition, and Transcode Videos require a **lot** of processing power and therefore do not exaggerate the amount of jobs because you're probably thoroughly overloading the server.

:::info Facial Recognition Concurrency
The Facial Recognition Concurrency value cannot be changed because
[DBSCAN](https://www.youtube.com/watch?v=RDZUdRSDOok) is traditionally sequential, but there are parallel implementations of it out there. Our implementation isn't parallel.
:::

## External Library

### Library watching (EXPERIMENTAL)

External libraries can automatically import changed files without a full rescan. It will import the file whenever the operating system reports a file change. If your photos are mounted over the network, this does not work.

### Periodic Scanning

You can define a custom interval for the trigger external library rescan under Administration -> Settings -> Library.  
You can set the scanning interval using the preset or cron format. For more information please refer to e.g. [Crontab Guru](https://crontab.guru/).

## Logging

The default Immich log level is `Log` (commonly known as `Info`). The Immich administrator can choose a higher or lower log level according to personal preference or as requested by the Immich support team.

## Machine Learning Settings

Through this setting, you can manage all the settings related to machine learning in Immich, from the setting of remote machine learning to the model and its parameters
You can choose to disable a certain type of machine learning, for example smart search or facial recognition.

### Smart Search

The smart search settings are designed to allow the search tool to be used using [CLIP](https://openai.com/research/clip) models that [can be changed](/docs/FAQ#can-i-use-a-custom-clip-model), different models will necessarily give better results but may consume more processing power, when changing a model it is mandatory to re-run the
Smart Search job on all images to fully apply the change.

:::info Internet connection
Changing models requires a connection to the Internet to download the model.
After downloading, there is no need for Immich to connect to the network
Unless version checking has been enabled in the settings.
:::

### Facial Recognition

Under these settings, you can change the facial recognition settings
Editable settings:

- **Facial Recognition Model -** Models are listed in descending order of size. Larger models are slower and use more memory, but produce better results. Note that you must re-run the Face Detection job for all images upon changing a model.
- **Min Detection Score -** Minimum confidence score for a face to be detected from 0-1. Lower values will detect more faces but may result in false positives.
- **Max Recognition Distance -** Maximum distance between two faces to be considered the same person, ranging from 0-2. Lowering this can prevent labeling two people as the same person, while raising it can prevent labeling the same person as two different people. Note that it is easier to merge two people than to split one person in two, so err on the side of a lower threshold when possible.
- **Min Recognized Faces -** The minimum number of recognized faces for a person to be created (AKA: Core face). Increasing this makes Facial Recognition more precise at the cost of increasing the chance that a face is not assigned to a person.

:::info
When changing the values in Min Detection Score, Max Recognition Distance, and Min Recognized Faces.
You will have to restart **only** the job FACIAL RECOGNITION - ALL.

If you replace the Facial Recognition Model, you will have to run the job FACE DETECTION - ALL.
:::

:::tip identical twins
If you have twins, you might want to lower the Max Recognition Distance value, decreasing this a **bit** can make it distinguish between them.
:::

## Map & GPS Settings

### Map Settings

In these settings, you can change the appearance of the map in night and day modes according to your personal preference and according to the supported options.
The map can be adjusted via [OpenMapTiles](https://openmaptiles.org/styles/) for example.

### Reverse Geocoding Settings

Immich supports [Reverse Geocoding](/docs/features/reverse-geocoding) using data from the [GeoNames](https://www.geonames.org/) geographical database.

## OAuth Authentication

Immich supports OAuth Authentication. Read more about this feature and its configuration [here](/docs/administration/oauth).

## Password Authentication

The administrator can choose to disable login with username and password for the entire instance. This means that **no one**, including the system administrator, will be able to log using this method. If [OAuth Authentication](/docs/administration/oauth) is also disabled, no users will be able to login using **any** method. Changing this setting does not affect existing sessions, just new login attempts.

:::tip
You can always use the [Server CLI](/docs/administration/server-commands) to re-enable password login.
:::

## Server Settings

### External Domain

When set, will override the domain name used when viewing and copying a shared link.

### Welcome Message

The administrator can set a custom message on the login screen (the message will be displayed to all users).

## Storage Template

Immich supports a custom [Storage Template](/docs/administration/storage-template). Learn more about this feature and its configuration [here](/docs/administration/storage-template).

## Theme Settings

You can write custom CSS that will get loaded in the web application for all users. This enables administrators to change fonts, colors, and other styles.

For example:

```css title='Custom CSS'
p {
  color: green;
}
```

## Thumbnail Settings

By default Immich creates 3 thumbnails for each asset,
Blurred (thumbhash) , Small (webp) , and Large (jpeg), using these settings you can change the quality for the thumbnail files that are created.

**Small thumbnail resolution**  
Used when viewing groups of photos (main timeline, album view, etc.). Higher resolutions can preserve more detail but take longer to encode, have larger file sizes, and can reduce app responsiveness.

**Large thumbnail resolution**  
Used when viewing a single photo and for machine learning. Higher resolutions can preserve more detail but take longer to encode, have larger file sizes, and can reduce app responsiveness.

**Quality**  
Thumbnail quality from 1-100. Higher is better for quality but produces larger files.

**Prefer wide gamut**  
Use display p3 for thumbnails. This better preserves the vibrance of images with wide color spaces, but images may appear differently on old devices with an old browser version. Srgb images are kept as srgb to avoid color shifts.

:::tip
The default resolution for Large thumbnails can be lowered from 1440p (default) to 1080p or 720p to save storage space.
:::

## Trash Settings

In the system administrator's option to set a trash for deleted files, these files will remain in the trash until the deletion date 30 days (default) or as defined by the system administrator.

The trash can be disabled, however this is not recommended as future files that are deleted will be permanently deleted.

:::tip Keyboard shortcut for permanently deletion
You can select assets and press Ctrl + Del from the timeline for quick permanent deletion without the trash option.
:::

## User Settings

### Delete delay

The system administrator can choose to delete users through the administration panel, the system administrator can delete users immediately or alternatively delay the deletion for users (7 days by default) this action permanently delete a user's account and assets. The user deletion job runs at midnight to check for users that are ready for deletion. Changes to this setting will be evaluated at the next execution.

## Version Check

When this option is enabled the `immich-server` will periodically make requests to GitHub to check for new releases.

## Video Transcoding Settings

The system administrator can define parameters according to which video files will be converted to different formats (depending on the settings). The settings can be changed in depth, to learn more about the terminology used here, refer to FFmpeg documentation for [H.264](https://trac.ffmpeg.org/wiki/Encode/H.264) codec, [HEVC](https://trac.ffmpeg.org/wiki/Encode/H.265) codec and [VP9](https://trac.ffmpeg.org/wiki/Encode/VP9) codec.
