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# tiffRepresentation(using:factor:)

Returns a TIFF representation of the image using the specified compression.

```
func tiffRepresentation(using comp: NSBitmapImageRep.TIFFCompression, factor: Float) -> Data?
```

## Parameters

`comp`

An enum constant that represents a TIFF data-compression scheme. Legal values for `compression` can be found in [`NSBitmapImageRep.TIFFCompression`](/documentation/AppKit/NSBitmapImageRep/TIFFCompression).

`factor`

A `float` value that provides a hint for those compression types that implement variable compression ratios.

    Currently only JPEG compression uses a compression factor. JPEG compression in TIFF files is not supported, and     `factor`     is ignored.

## Discussion

If the compression type isn’t supported for writing TIFF data (for example, [`NSBitmapImageRep.TIFFCompression.next`](/documentation/AppKit/NSBitmapImageRep/TIFFCompression/next)), the stored compression is changed to [`NSBitmapImageRep.TIFFCompression.none`](/documentation/AppKit/NSBitmapImageRep/TIFFCompression/none) before the TIFF representation is generated.

If a problem is encountered during generation of the TIFF, [`tiffRepresentation(using:factor:)`](/documentation/AppKit/NSBitmapImageRep/tiffRepresentation(using:factor:)) raises an [`NSTIFFException`](/documentation/AppKit/NSTIFFException) or an [`NSBadBitmapParametersException`](/documentation/AppKit/NSBadBitmapParametersException).

## 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.

[`canBeCompressed(using:)`](/documentation/AppKit/NSBitmapImageRep/canBeCompressed(using:))

Tests whether the bitmap image representation can be compressed by the specified compression scheme.

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

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


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