I am looking for the steps to prepare an image (a base layer photograph) with a grayscale result like the images attached. I am not asking about the colors and embellishments.
In Photoshop I have tried various techniques for an end result in the style: Threshold Effect/CMYK Separation/Risograph/Halftone/Stipple ... no success.
What I see in these posters is a smooth graduation in the grayscale, so not a threshold/stencil/Banksy, not a silk screen Warhol effect, though some of his images do show characteristics of the style I am going for. The techniques I have tried do not reproduce the look.
Again I am only interested in learning the technique to prepare the very base layer image (photograph) to the grayscale style.
And yes I have printed a photo and then photocopied/enlarged/re-photocopied it and the result was not close. It was cool but not the technique.
Closest successful process in filter gallery:
Artistic > Sponge (Brush Size: 0, Definition: 0, Smoothness: 7).
Texture > Grain (Intensity: 20, Contrast: 25, Grain Type: Horizontal).
Distort > Diffuse Glow (Graininess: 0, Glow Amount: 2, Clear Amount: 18).
Sketch > Halftone Pattern (Size: 1, Contrast: 5, Pattern Type: Dot).
Distort > Diffuse Glow (Graininess: 0, Glow Amount: 3, Clear Amount: 14).