Apply Posterize Effect to images

Posterize effect, also known as posterization, is a technique used to reduce the number of colors in an image. This effect can be applied to photographs, digital images, or artwork to create a simplified, more stylized look. It is often used to create a more artistic or retro look to an image, or to make it appear more like a comic book or cartoon. The posterize effect is also used in graphic design and illustration to create a specific aesthetic or to emphasize certain features of an image.