Step 1:
Open the design you want to give a halftone dot effect.
Step 2:
Create a layer under the original design.
Create a shape that you want to convert into dots.
I copied the outside shape of my design and filled it with black.
Step 3:
You have to enlarge the shape so far that the later created halftone dots are visible below your original design.
My design is round so i can use the scaling option in Illustrator.
If your design has a special shape you have to manually adjust it.
Step 4:
Select Effect > Blur > Gaussian Blur
Use a Radius you want.
The result looks like this
Step 5:
Select Object > Rasterize…
The resolution should be 600 dpi or more.
Step 6:
Select the object and select Effect > Pixelate > Color Halftone…
The color halftone dialog box will open where you can enter some numbers to adjust the appearance of the effect.
Set a number for the Max. Radius.
This will determine the size of the largest dot in the effect.
The screen angles should be equal.
Step 7:
We need to convert the raster image to vector.
Select the shape and select Object > Live Trace > Make and Expand from the menu.
The shape is now a full vector object.
Step 8:
Select with the Magic wand tool the white area and press delete.
Step 9:
Step 10:
Now we are able to assign the color and set the appearance of the design to overlay with the transparency menu.
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