---
title: "jpegPhotoDataRepresentation(forJPEGSampleBuffer:previewPhotoSampleBuffer:)"
framework: avfoundation
role: symbol
role_heading: Type Method
path: "avfoundation/avcapturephotooutput/jpegphotodatarepresentation(forjpegsamplebuffer:previewphotosamplebuffer:)"
---

# jpegPhotoDataRepresentation(forJPEGSampleBuffer:previewPhotoSampleBuffer:)

Returns data in JPEG format corresponding to the captured photo in the specified sample buffer.

## Declaration

```swift
class func jpegPhotoDataRepresentation(forJPEGSampleBuffer JPEGSampleBuffer: CMSampleBuffer, previewPhotoSampleBuffer: CMSampleBuffer?) -> Data?
```

## Parameters

- `JPEGSampleBuffer`: A sample buffer containing the JPEG photo capture result to be formatted for output.
- `previewPhotoSampleBuffer`: An optional additional sample buffer containing a preview-resolution version of the photo capture result, to be added to the JPEG output as a thumbnail image. Pass nil to skip adding a preview image to the output.

## Return Value

Return Value A data object containing a JPEG representation of the requested photo capture results, or nil if the sample buffers cannot be packaged for output.

## Discussion

Discussion After you request a photo capture with the capturePhoto(with:delegate:) method, the photo capture output delivers results to your delegate as one or more CMSampleBuffer objects. (See the photoOutput(_:didFinishProcessingPhoto:previewPhoto:resolvedSettings:bracketSettings:error:) method.) To repackage the sample buffer’s content for output as a JPEG file, use this class method. Optionally, you can include metadata in the resulting JPEG output by attaching it to the sample buffer before calling this method. important: The jpegSampleBuffer parameter must reference a sample buffer from a JPEG capture. See the format property for photo capture settings.

## See Also

### Getting formatted output

- [dngPhotoDataRepresentation(forRawSampleBuffer:previewPhotoSampleBuffer:)](avfoundation/avcapturephotooutput/dngphotodatarepresentation(forrawsamplebuffer:previewphotosamplebuffer:).md)