Posterize Image

Posterization turns smooth photographs into areas of flat color, the look of screen-printed posters, comic panels and street-art stencils. This tool offers three versions of the effect: classic posterization with a chosen number of levels, a two-tone stencil, and pop-art color palettes.

Classic posterize

Each color channel is reduced to a fixed number of levels. With 4 levels per channel, red, green and blue can each take only four values, giving at most 64 colors, and smooth gradients break into bands of flat color. Two levels produce a bold, eight-color graphic; six to eight levels look like a subtly stylized photo. Portraits and landscapes with clear light and shadow posterize best.

Two-tone stencil

The stencil mode splits the image at a brightness threshold: everything darker becomes ink, everything lighter becomes paper. Move the threshold to decide how much detail ends up in the ink. Faces usually need a threshold slightly above the middle so that eyes, nose and mouth outlines survive. Ink and paper can be any colors.

Transparent paper

Switch on transparent paper and the light areas become transparent. The result is ready for stencils, laser engraving, T-shirt designs, stickers and screen-printing positives. Because JPG cannot store transparency, the download switches to PNG automatically.

Pop-art palettes

The palette mode maps the brightness of the image onto a set of bold colors. “Pop art” uses the pink, orange, yellow and blue of 1960s silkscreen portraits. “Hope poster” uses navy, red, beige and light blue, the palette made famous by a 2008 campaign poster. “Neon” goes for purple, magenta and cyan; “Risograph” mimics the blue and fluorescent pink of riso printing; “3-tone gray” gives a clean graphic look. Every color in a palette can be changed.

Preparing photos for strong results

High contrast and simple backgrounds work best. Crop tightly around a face or object, remove a busy background first with Remove Image Background, and increase contrast if the photo is flat. Side lighting creates clear shadow shapes, which posterize into striking graphic forms.

Pixel-perfect output

The effect is calculated on every pixel at full resolution when you download; the preview uses a reduced copy for speed. For printing, start with a large image so the flat areas have clean edges.

Making vectors

Flat-color images are ideal for vector tracing. After posterizing or creating a stencil, Image to SVG converts the shapes into scalable paths for cutting plotters, laser cutters and large-format printing.

Creative ideas

Pet portraits in pop-art colors, a band poster from a concert photo, a stencil for spray painting, a logo-like silhouette of a building, or a set of four differently colored prints of the same face, gallery style.

Screen-printing separations

Screen printers need one stencil per color. Posterize to a small palette first to decide the colors, then make a two-tone stencil for each color layer by adjusting the threshold, saving each as a transparent PNG. Every layer becomes one screen. The Screen Printing Calculator helps with mesh counts and exposure for those screens.

Related tools

For dotted print patterns, try the Image Dithering Tool. For a blocky retro look, use the Pixel Art Converter. To print a large poster across several sheets, see Posterize PDF.