# properties(_:) Tells the host application about what the plug-in needs and supports, such as whether it renders in a gamma-corrected color space or a linear one. ``` func properties(_ properties: AutoreleasingUnsafeMutablePointer?) throws ``` ## Parameters `properties` An containing the values of any properties you want to tell the host you support or don’t support. ## Discussion This method is called once per plug-in instantiation and the result is cached for later use by the host application. The dictionary returned by this method should contain various `kFxPropertyKeys` and their corresponding values. ## Topics ### Property Keys [`var kFxPropertyKey_NeedsFullBuffer: String`](/documentation/professional_video_applications/kFxPropertyKey_NeedsFullBuffer) A key that determines whether the plug-in needs the entire image to do its processing, and can’t tile its rendering. [`var kFxPropertyKey_VariesWhenParamsAreStatic: String`](/documentation/professional_video_applications/kFxPropertyKey_VariesWhenParamsAreStatic) A key that determines whether your rendering varies even when the parameters remain the same. [`var kFxPropertyKey_ChangesOutputSize: String`](/documentation/professional_video_applications/kFxPropertyKey_ChangesOutputSize) A key that determines whether your filter has the ability to change the size of its output to be different than the size of its input. [`var kFxPropertyKey_DesiredProcessingColorInfo: String`](/documentation/professional_video_applications/kFxPropertyKey_DesiredProcessingColorInfo) A key that determines whether your plug-in renders in linear or gamma-corrected color space. --- 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)