---
title: kQLThumbnailOptionScaleFactorKey
framework: quicklook
role: symbol
role_heading: Global Variable
path: quicklook/kqlthumbnailoptionscalefactorkey
---

# kQLThumbnailOptionScaleFactorKey

The scale factor for the thumbnail.

## Declaration

```swift
let kQLThumbnailOptionScaleFactorKey: CFString!
```

## Discussion

Discussion The scale factor is a float value that’s encapsulated in a CFNumber object. If this option is absent, the default value is 1.0.

## See Also

### Constants

- [kQLReturnMask](quicklook/kqlreturnmask.md)
- [kQLReturnHasMore](quicklook/kqlreturnhasmore.md)
- [kQLThumbnailOptionIconModeKey](quicklook/kqlthumbnailoptioniconmodekey.md)
- [QUICKLOOK_VERSION](quicklook/quicklook_version.md)