Real Cmyk Halftone Simulation Actions is a collection of 244 Professional Detailed Photoshop Actions for simulating halftone cmyk process with round, diamond, cross and lines pattern options. Each pattern style has 61 frequency variation. This lets you use these action nearly any image with different sizes and resolutions. All actions create one flatten layer with effect and its transparent version in order to use it with your paper texture or custom color. (Reference: http://www.grymoire.com/Postscript/Halftones.html)