What does posterize mean?

It snaps each colour channel to a few set levels, so smooth gradients become flat bands.

Fewer levels or more?

Fewer levels gives a stronger, more graphic poster effect; more keeps the photo closer to the original.

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Reduce the number of colours in a photo for a bold, graphic poster look. Free, runs offline.

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Colour levels

What does posterize mean?: It snaps each colour channel to a few set levels, so smooth gradients become flat bands.
Fewer levels or more?: Fewer levels gives a stronger, more graphic poster effect; more keeps the photo closer to the original.