# applyingFilter(_:parameters:) Returns a new image created by applying a filter to the original image with the specified name and parameters. ``` func applyingFilter(_ filterName: String, parameters params: [String : Any]) -> CIImage ``` ## Parameters `filterName` The name of the filter to apply, as used when creating a [`CIFilter`](/documentation/CoreImage/CIFilter-swift.class) instance with the [`init(name:)`](/documentation/CoreImage/CIFilter-swift.class/init(name:)) method. `params` A dictionary whose key-value pairs are set as input values to the filter. Each key is a constant that specifies the name of an input parameter for the filter, and the corresponding value is the value for that parameter. See [Core Image Filter Reference](https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/uid/TP40004346) for built-in filters and their allowed parameters. ## Return Value An image object representing the result of applying the filter. ## Discussion Calling this method is equivalent to the following sequence of steps: 1. Creating a [`CIFilter`](/documentation/CoreImage/CIFilter-swift.class) instance 2. Setting the original image as the filter’s `inputImage` parameter 3. Setting the remaining filter parameters from the `params` dictionary 4. Retrieving the [`outputImage`](/documentation/CoreImage/CIFilter-swift.class/outputImage) object from the filter > Important: > This method, though convenient, is inefficient if used multiple times in succession. Achieve better performance by chaining filters without asking for the outputs of individual filters. For more information, see . --- 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)