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# representation(using:properties:)

Formats the bitmap representation’s image data using the specified storage type and properties and returns it in a data object.

```
func representation(using storageType: NSBitmapImageRep.FileType, properties: [NSBitmapImageRep.PropertyKey : Any]) -> Data?
```

## Parameters

`storageType`

A constant that specifies a file type for bitmap images. It can be [`NSBMPFileType`](/documentation/AppKit/NSBMPFileType), [`NSGIFFileType`](/documentation/AppKit/NSGIFFileType), [`NSJPEGFileType`](/documentation/AppKit/NSJPEGFileType), [`NSPNGFileType`](/documentation/AppKit/NSPNGFileType), or [`NSTIFFFileType`](/documentation/AppKit/NSTIFFFileType).

`properties`

A dictionary that contains key-value pairs specifying image properties. These string constants used as keys and the valid values are described in [`NSBitmapImageRep.PropertyKey`](/documentation/AppKit/NSBitmapImageRep/PropertyKey).

## Return Value

A data object containing the receiver’s image data in the specified format. You can write this data to a file or use it to create a new [`NSBitmapImageRep`](/documentation/AppKit/NSBitmapImageRep) object.

## See Also

[`tiffRepresentation(using:factor:)`](/documentation/AppKit/NSImage/tiffRepresentation(using:factor:))

Returns a data object that contains TIFF data with the specified compression settings for all of the image representations in the image.

[`tiffRepresentation`](/documentation/AppKit/NSImage/tiffRepresentation)

A data object containing TIFF data for all of the image representations in the image.


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