What does it mean to posterize an image?
transitive verb. : to print or display (an image, such as a photograph) with a limited number of tones or colors in a way suggesting or appropriate to a poster.
How can I posterize a photo for free?
There are a few ways that you can posterize an image without Photoshop. One way is to use an online tool like PicMonkey. Another way is to use a free program like GIMP. Finally, you can use Microsoft Paint.