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66 lines
2.5 KiB
66 lines
2.5 KiB
---
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layout: page
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title: "Snapshot Size"
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description: "Sizing the snapshots output"
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order: 10
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disqus: 1
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---
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Snapshots are captured from the preview stream instead of using a separate capture channel.
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They are extremely fast, small in size, and give you a low-quality output that can be easily
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uploaded or processed.
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The snapshot size is based on the size of the preview stream, which is described in the [Preview Size](preview-size) document.
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Although the preview stream size is customizable, note that this is considered an advanced feature,
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as the best preview stream size selector already does a good job for the vast majority of use cases.
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When taking snapshots, the preview stream size is then changed to match some constraints.
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### Matching the preview ratio
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Snapshots will automatically be cropped to match the preview aspect ratio. This means that if your
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preview is square, you can finally take a square picture or video, regardless of the available sensor sizes.
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Take a look at the [Preview Size](preview-size) document to learn about preview sizing.
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### Other constraints
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You can refine the size further by applying `maxWidth` and a `maxHeight` constraints:
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```java
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cameraView.setSnapshotMaxWidth(500);
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cameraView.setSnapshotMaxHeight(500);
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```
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These values apply to both picture and video snapshots. If the snapshot dimensions exceed these values
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(both default `Integer.MAX_VALUE`), the snapshot will be scaled down to match the constraints.
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This is very useful as it decouples the snapshot size logic from the preview. By using small constraints,
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you can have a pleasant, good looking preview stream, while still capturing fast, low-res snapshots
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with no issues.
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### Video Codec requirements
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When taking video snapshots, the video codec that the device provides might require extra constraints,
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like
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- width / height alignment
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- maximum width or height
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CameraView will try to read these requirements and apply them, which can result in video snapshots
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that are smaller than you would expect, or with a **very slightly** different aspect ratio.
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### XML Attributes
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```xml
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<com.otaliastudios.cameraview.CameraView
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app:cameraSnapshotMaxWidth="500"
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app:cameraSnapshotMaxHeight="500"/>
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```
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### Related APIs
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|Method|Description|
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|------|-----------|
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|`setSnapshotMaxWidth(int)`|Sets the max width for snapshots. If out of bounds, the output will be scaled down.|
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|`setSnapshotMaxHeight(int)`|Sets the max height for snapshots. If out of bounds, the output will be scaled down.| |