Negative, posterize, solarize

Negative

This effect replaces the color of each pixel with its negative.

Posterize

This effect is used to reduce the number of colors on the screen and simplifies the original image or video footage. The Number of colors parameter may be set using the mini-slider and locked with a keyframe.

Solarize

This effect reproduces the photographic effect named solarization which consists of mixing the colors of an image with the colors of its negative.