How to remove banding from a gradient in Adobe Illustrator
If your gradient in Illustrator has visible stripes or steps, you're suffering from a vector problem called gradient banding. In such cases, it's usually suggested to add a texture to the fill, which is what we'll try.
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As you can see from the video, banding can't be completely solved directly in Adobe Illustrator. The texture method, for example, merely masks the steps in the gradient. Therefore, if you're looking for a smooth and clean gradient, you can export your design from Illustrator to Adobe Photoshop and apply gradient fills there. Photoshop produces a smoother gradient. To export, select File - Export as - Photoshop(*.PSD). The resulting file can be opened in Photoshop and then manipulated with colors.