Open the document in Photoshop.Go to Image -> Mode -> RGB color to Lab Color.
Go to Channels -> a channel and go to image -> adjustments -> Posterize. The Posterize value will be 4.
Go to b channel -> Image -> adjustments -> Posterize ->4 and have a blur filter. Go to Filter -> Blur -> Gaussian Blur
Then Go to Filter Gallery -> Cutout Effect. Adjust the Values according to Your needs.It will give a Pop art effect.
Change the Lab color mode to RGB Mode .Now the image turns in to a Pop-art effect.
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