sharpenLuminance()

Declaration

class func sharpenLuminance() -> any CIFilter & CISharpenLuminance

Return Value

The modified image.

Discussion

This method applies the sharpen luminance filter to an image. The effect increases image detail by adjusting the luminance of each pixel within the radius property. Sharpening the luminance doesn’t effect the chroma data of each pixel.

The bicubic sharpen luminance filter uses the following properties:

inputImage

An image with the type CIImage.

radius

A float representing the area of effect as an NSNumber.

sharpness

A float representing the desired strength of the effect as an NSNumber.

The following code creates a filter that results in detail from the sign in the image to be more visible:

func sharpen (inputImage: CIImage) -> CIImage? {
    let sharpenLuminance = CIFilter.sharpenLuminance()
    sharpenLuminance.inputImage = inputImage
    sharpenLuminance.radius = 10
    sharpenLuminance.sharpness = 1
    return sharpenLuminance.outputImage!
}

[Image]

See Also

Filters

• unsharpMask()