Quick Tip: How to Create Multi-Tone Vector Noise | Envato Tuts+

Step 3 The pattern itself doesn't have clear boundaries, so to make it easier to work with we will need to give it a rough guide outline. If you look in your layer palette, within the group you will see that the pattern is created by a group of dots. If you scroll right down to the bottom of this group, you will notice there is a square path with no fill or stroke color. We want to copy this shape

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イラレでノイズを描くチュートリアル