: Recreating Anti-Alliasing/Moiré effects I'm currently designing a poster, and when I view the design in Illustrator my Ben-Day dotted images are heavily distorted in their color and spatial appearance.

@Heady304

If we look how the Moiré pattern is created we can see that it is the result of rotating linear patterns:


Soure: Wikimedia

This is mostly unwanted on fast method scaling of images that have a regular pattern, or on displaying such images on a display made up of regular patterns too (like our screens).

To intentionally produce this effect we need a source image dithered with a regular pattern such as the halftone dithering of the example given.

Below are steps to transform an image with adding Moiré:


Dither source image using a regular pattern:


Copy the image and paste it as a layer on top of the dithered source
Apply a rotation to the pasted layer (the angle will control the effect size)


Moiré overlay with transparency


Moiré overlay with 50% opacity


Moiré overlay with a line-dithered source


From examples above we can see that the primary dithering technique will deptermine the shape of our Moiré (diamonds produce diamonds and lines will produce lines).

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