Contents

dotScreen()

Creates a monochrome image with a series of dots to add detail.

Declaration

class func dotScreen() -> any CIFilter & CIDotScreen

Return Value

The modified image.

Discussion

This method applies a dot screen filter to an image. The effect generates a monochrome image containing a series of dots creating detail. The halftone effect is a set of lines, dots, or circles that contain detail. When viewing the image from a distance, the markings blend together, creating the illusion of continuous lines and shapes. Print media commonly uses this effect.

The dot screen filter uses the following properties:

inputImage

An image with the type CIImage.

center

A set of coordinates marking the center of the image as a CGPoint.

width

A float representing the distance between dots in the pattern as an NSNumber.

sharpness

A float representing the sharpness of the pattern as an NSNumber.

The following code creates a filter that produces an image containing monochrome dots of detail on a black background:

func dot (inputImage: CIImage) -> CIImage {
    let dotScreen = CIFilter.dotScreen()
    dotScreen.inputImage = inputImage
    dotScreen.angle = 0
    dotScreen.center = CGPoint(x: 2016, y: 1512)
    dotScreen.width = 35
    dotScreen.sharpness = 0.7
    return dotScreen.outputImage!
}

[Image]

See Also

Filters