# getTIFFCompressionTypes(_:count:) Returns by indirection an array of all available compression types that can be used when writing a TIFF image. ``` class func getTIFFCompressionTypes(_ list: UnsafeMutablePointer?>, count numTypes: UnsafeMutablePointer) ``` ## Parameters `list` On return, a C array of [`NSBitmapImageRep.TIFFCompression`](/documentation/AppKit/NSBitmapImageRep/TIFFCompression) constants. This array belongs to the [`NSBitmapImageRep`](/documentation/AppKit/NSBitmapImageRep) class; it shouldn’t be freed or altered. See [`NSBitmapImageRep.TIFFCompression`](/documentation/AppKit/NSBitmapImageRep/TIFFCompression) for the supported TIFF compression types. `numTypes` The number of constants in list. ## Discussion Note that not all compression types can be used for all images: [`NSBitmapImageRep.TIFFCompression.next`](/documentation/AppKit/NSBitmapImageRep/TIFFCompression/next) can be used only to retrieve image data. Because future releases may include other compression types, always use this method to get the available compression types—for example, when you implement a user interface for selecting compression types. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)