In article <U7_gf.50658$>,
"photoshopstof" wrote:

In the attachement, there's a picture with a great effect, but how can i make this effect ?

Easy as pie. That's the Color Halftone filter.

Start with a grayscale image, run the Halftone filter, convert it to RGB, then make it whatever color you like by using Hue & Saturation with Colorize turned on or by using Edit->Fill in Color mode.

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