Use of Opacity Masks

This tutorial will help you to know the various uses of opacity masks.

Create highlights

Here we are going to create a shape having highlight using opacity mask.

What is an opacity mask?

Opacity mask is used to mask off an area of an object and selectively allow visibility to whatever is underneath. Opacity is the measure of see-through an object is. The more opaque the object is the less see through it will have. So adding a mask means you are only allowing some light to pass through. It can be used to create a realistic light effect. It is said that light defines the shape of an object by reflecting off it. You can use the opacity mask in illustrator to create such an effect.

 

Starting from a base shape

Let us start with a base shape. Here I have used a circle having a simple gradient and stroke.

use a circle having a simple gradient and stroke
Now we need to create a highlight. You can either use the pathfinder panel or the pen tool to create this effect.

either use the pathfinder panel or the pen tool
Create a new layer. Copy the highlighted shape. Fill it with a black and white gradient. Apply the Opacity Mask. Now you can see through the white portion but the black portion will be masked. Here, the light source is coming from the top left.

the highlighted shape fill it with a black and white gradient

Making the opacity mask

Creating the opacity mask

Select the highlight and the gradient layers. Go to the Transparency Panel (Window > Transparency). In the right hand corner at the top there is a flyout menu. From it choose Create Opacity Mask.

choose Create Opacity Mask.
That’s it. This is a way you can create light effect in illustrator.

 create light effect in illustrator.

Final Image

 Use of Opacity Masks has be implemented

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