---
title: "QLThumbnailCopyImage(_:)"
framework: quicklook
role: symbol
role_heading: Function
path: "quicklook/qlthumbnailcopyimage(_:)"
---

# QLThumbnailCopyImage(_:)

Returns a thumbnail image.

## Declaration

```swift
func QLThumbnailCopyImage(_ thumbnail: QLThumbnail!) -> Unmanaged<CGImage>!
```

## Parameters

- `thumbnail`: The thumbnail to compute.

## Return Value

Return Value A thumbnail image, or NULL if the Quick Look framework can’t create a thumbnail.

## Discussion

Discussion If you call this function directly without using QLThumbnailDispatchAsync(_:_:_:), this function blocks the calling thread until it finishes computing the thumbnail.

## See Also

### Creating thumbnails

- [QLThumbnailImageCreate(_:_:_:_:)](quicklook/qlthumbnailimagecreate(_:_:_:_:).md)
- [QLThumbnailCreate(_:_:_:_:)](quicklook/qlthumbnailcreate(_:_:_:_:).md)
- [QLThumbnailDispatchAsync(_:_:_:)](quicklook/qlthumbnaildispatchasync(_:_:_:).md)
- [QLThumbnailCancel(_:)](quicklook/qlthumbnailcancel(_:).md)
- [QLThumbnailCopyDocumentURL(_:)](quicklook/qlthumbnailcopydocumenturl(_:).md)
- [QLThumbnailCopyOptions(_:)](quicklook/qlthumbnailcopyoptions(_:).md)
- [QLThumbnailGetContentRect(_:)](quicklook/qlthumbnailgetcontentrect(_:).md)
- [QLThumbnailGetMaximumSize(_:)](quicklook/qlthumbnailgetmaximumsize(_:).md)
- [QLThumbnailGetTypeID()](quicklook/qlthumbnailgettypeid().md)
- [QLThumbnailIsCancelled(_:)](quicklook/qlthumbnailiscancelled(_:).md)