Acorn Acorn 7

Generators, Gradients, & Halftone Effect

Many of the filter definitions below come directly from Apple’s core image filter reference. 


Checkerboard:  Generates a checkerboard pattern. You can specify the checkerboard size and colors, and the sharpness of the pattern.



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Circles:  Adds concentric circles to your image.

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Grid:  Generates a grid with modifiable positioning, color, distance, and width.


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Lenticular Halo: Simulates a lens flare. 

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Random Generator: Generates an image of infinite extent whose pixel values are made up of four independent, uniformly-distributed random numbers in the 0 to 1 range.

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Random Noise: Creates random noise with option for grayscale.

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Render Clouds: Generates cloud-like noise, also known as Perlin-noise.

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Star Shine: Generates a starburst pattern that is similar to a supernova; can be used to simulate a lens flare.

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Stripes: Generates a stripe pattern. You can control the color of the stripes, the spacing, and the contrast.


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Sunbeams: Generates a sun effect.


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Sunburst: Generates a two color sunburst.


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Linear Gradient: Generates a gradient that varies along a linear axis between two defined endpoints.

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Radial Gradient: Generates a gradient that varies radially between two circles having the same center.

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Smooth Linear Gradient: Generates a gradient that uses an S-curve function to blend colors along a linear axis between two defined endpoints.

Halftone Effect

Circular Screen: Simulates a circular-shaped halftone screen.

circular screen2.acorn

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CMYK Halftone: Creates a color, halftoned rendition of the source image, using cyan, magenta, yellow, and black inks over a white page.

cmyk halftone.acorn

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Dot Screen: Simulates the dot patterns of a halftone screen.

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Hatched Screen: Simulates the hatched pattern of a halftone screen.

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Line Screen: Simulates the line pattern of a halftone screen.

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Try playing around with some of the filters and experiment, experiment, experiment.  For more information, check out the Tutorials or send an email to and request a tutorial.

Additional Relevant Documentation  

Filters Basics (video tutorial)

Filters Basics