Recreating Anti-Alliasing/MoirÃ© 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.
I really like this. Is there a way I could (possibly in Photoshop) recreate these distortions so they end up in my exported pdf?
This is how the poster looks when exported to png:
Here's a screen-shot from Illustrator:
If we look how the MoirÃ© pattern is created we can see that it is the result of rotating linear patterns:
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 MoirÃ©:
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)
MoirÃ© overlay with transparency
MoirÃ© overlay with 50% opacity
MoirÃ© overlay with a line-dithered source
From examples above we can see that the primary dithering technique will deptermine the shape of our MoirÃ© (diamonds produce diamonds and lines will produce lines).