All effects and presets

Effect

Posterize

Reduce tonal steps for flat, poster-style colour banding.

Posterisation reduces the number of tonal steps so gradients become bands. The name nods to poster printing, where limited inks forced flat colour. Pop art and screen print made those bands a feature.

Fewer levels look graphic. More levels look like a subtle contour map.

Posterize example
Example

Properties

  • Levels

    number of tone steps

    Range
    2 to 32
    Default
    6

  • Gamma

    tone curve before quantize

    Range
    0.3 to 3
    Default
    1

  • Mode

    quantize each channel or luminance only

    Range
    RGB, Luma
    Default
    RGB

  • Dither

    ordered dither before quantize

    Range
    0 to 1
    Default
    0.15

Command line

Requires Rethings Pro. Install the tool from Rethings → Install Command Line Tool… 

rethings apply --effect posterize --set levels=6 --set gamma=1 -i input.jpg -o output.png

Gallery

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