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title: Previews
---
A `preview` is a dictionary containing metadata for optional thumbnail images or videos that can be used in the ClearML Enterprise
WebApp (UI) to view selected content in a Dataset. `previews` includes the `uri` of the thumbnail image or video.
Previews are optional images or videos that can be used in the ClearML Enterprise
WebApp (UI) to help visualize selected content in a Hyper-Dataset.
Previews are not mandatory. Their primary use is to view images with formats that cannot be displayed in a web browser
(such as TIFF and 3D formats).
They are useful for displaying images with formats that cannot be rendered in a web browser
(such as TIFF and 3D formats), or to provide an alternative visual representation of the data.
## Example
In a Hyper-Dataset frame, the `source` typically points to the original raw data used for training or experimentation,
while the `preview_uri` is intended for display in the UI.
The following is an example of preview metadata.
Previews appear in the following WebApp pages:
* [Dataset version page](webapp/webapp_datasets_versioning.md): As thumbnails representing each frame in the dataset version.
If a `preview_uri` is provided, it will be used for the thumbnail. Otherwise, the frame's source is shown.
```json
"preview": {
"content_type": "image/jpg",
"uri": "https://s3.amazonaws.com/my_previews/car_1/front_preview.jpg",
"timestamp": 0
}
![Previews](../img/hyperdatasets/dataset_versions.png#light-mode-only)
![Previews](../img/hyperdatasets/dataset_versions_dark.png#dark-mode-only)
If the `preview_uri` points to a video, the thumbnail includes video controls:
![Video previews](../img/hyperdatasets/video_preview.png#light-mode-only)
![Video previews](../img/hyperdatasets/video_preview_dark.png#dark-mode-only)
* [Frame viewer](webapp/webapp_datasets_frames.md): When inspecting a single frame, the frame viewer lets you toggle between the
`source` and the `preview_uri` if both are provided and differ. If no `preview_uri` is provided, the frame's source is
shown.
![Use source toggle](../img/hyperdatasets/source_preview.png#light-mode-only)
![Use source toggle](../img/hyperdatasets/source_preview_dark.png#dark-mode-only)
## Usage
### Register Frames with a Preview
To register frames with a preview,set the `preview_uri` when creating the frame:
```python
# create dataset version
version = DatasetVersion.create_version(
dataset_name="Example",
version_name="Registering frame with preview"
)
frame = SingleFrame(
source='https://acme-datasets.s3.amazonaws.com/tutorials/000012.jpg',
width=512, height=512,
preview_uri='https://acme-datasets.s3.amazonaws.com/images/000012.jpg'
)
# add frame to version
version.add_frames([frame])
```
<Collapsible type="configuration" title="View an entire frame containing a preview">
```json
{
"timestamp": 1234567889,
"context_id": "car_1",
"meta": {
"velocity": "60"
},
"sources": [
{
"id": "front",
"content_type": "video/mp4",
"width": 800,
"height": 600,
"uri": "https://s3.amazonaws.com/my_cars/car_1/front.mp4",
"timestamp": 1234567889,
"meta" :{
"angle":45,
"fov":129
},
"preview": {
"content_type": "image/jpg",
"uri": "https://s3.amazonaws.com/my_previews/car_1/front_preview.jpg",
"timestamp": 0
},
"masks": [
{
"id": "seg",
"content_type": "video/mp4",
"uri": "https://s3.amazonaws.com/seg_masks/car_1/front_seg.mp4",
"timestamp": 1234567889
},
{
"id": "instances_seg",
"content_type": "video/mp4",
"uri": "https://s3.amazonaws.com/seg_masks/car_1/front_instance_seg.mp4",
"timestamp": 1234567889
}
]
},
{
"id": "rear",
"uri": "https://s3.amazonaws.com/my_cars/car_1/rear.mp4",
"content_type": "video/mp4",
"timestamp": 1234567889
}
],
"rois": [
{
"sources": ["front"],
"label": ["bike"],
"poly":[30, 50, 50,50, 100,50, 100,100],
"meta": {
"velocity": 5.4
}
},
{
"sources": ["front", "rear"],
"label": ["car"],
"poly":[30, 50, 50,50, 100,50, 100,100]
}
]
}
```
</Collapsible>
Here's an example of Previews in the ClearML Enterprise WebApp (UI). Each thumbnail is a Preview:
![Previews](../img/hyperdatasets/dataset_versions.png#light-mode-only)
![Previews](../img/hyperdatasets/dataset_versions_dark.png#dark-mode-only)
If the preview's `uri` is for a video, the thumbnail will display the video with video controls:
![Video previews](../img/hyperdatasets/video_preview.png#light-mode-only)
![Video previews](../img/hyperdatasets/video_preview_dark.png#dark-mode-only)

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@ -42,8 +42,8 @@ For more information, see [Masks](masks.md).
### Previews
`previews` is a dictionary containing metadata for optional thumbnail images that can be used in the ClearML Enterprise WebApp (UI)
to view selected images in a Hyper-Dataset. `previews` includes the `uri` of the thumbnail image.
Previews are optional images or videos that can be used in the ClearML Enterprise WebApp (UI)
to view images in a Hyper-Dataset.
For more information, see [Previews](previews.md).

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|<img src="/docs/latest/icons/ico-arrow-right.svg" alt="Next frame icon" className="icon size-md space-sm" />|Go to the next frame | Right arrow |
|<img src="/docs/latest/icons/ico-skip-next.svg" alt="Jump to next unfiltered annotation" className="icon size-md space-sm" />|Go to the next frame containing a non-filtered annotation (same filter as <img src="/docs/latest/icons/ico-skip-previous.svg" alt="Jump to previous unfiltered annotation" className="icon size-md space-sm" />).| <img src="/docs/latest/icons/ico-optional-no.svg" alt="Not applicable" className="icon size-md center-md" /> |
|<img src="/docs/latest/icons/ico-skip-forward.svg" alt="Jump forwards icon" className="icon size-md space-sm" />|Jump forwards ten frames | CTRL + Right arrow |
|`Use Source Data`|Show the frame’s `source` rather than its `preview_uri`| <img src="/docs/latest/icons/ico-optional-no.svg" alt="Not applicable" className="icon size-md center-md" /> |
|`Use Source Data`|Show the frame's `source` rather than its `preview`| <img src="/docs/latest/icons/ico-optional-no.svg" alt="Not applicable" className="icon size-md center-md" /> |
|<img src="/docs/latest/icons/ico-revert.svg" alt="Reload frame icon" className="icon size-md space-sm" />|Reload the frame.| <img src="/docs/latest/icons/ico-optional-no.svg" alt="Not applicable" className="icon size-md center-md" /> |
|<img src="/docs/latest/icons/ico-undo.svg" alt="Undo icon" className="icon size-md space-sm" />|Undo changes.|Ctrl + Z|
|<img src="/docs/latest/icons/ico-redo.svg" alt="Redo icon" className="icon size-md space-sm" />|Redo changes.|Ctrl + Y|

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