A knock out is a term used in image editing to describe the process of removing a selected area of an image. The area removed can be replaced with another image or with a solid color. This technique is often used to remove the background of an image, leaving the subject in the foreground.
A Knock Out is a term used in image editing to describe the process of removing a background from a layer so that only the foreground object on that layer remains. The foreground object can then be placed on a different background, or layer, creating the illusion that the object is floating.
The term originates from the printing industry, where a printing plate would be “knocked out” of its background, so that only the desired image remained on the plate. This process would be repeated for each color that was to be printed, with each color being printed on a separate plate.
Nowadays, the term is used more broadly to describe the process of removing a background from any layer, not just a printing plate. The process can be done manually, using a variety of tools, or automatically, using a Knock Out filter.
There are a few reasons why you might want to remove a background from a layer. One reason is to create a transparency effect. For example, you might want to place a logo on top of a background image, but have the background image show through the logo. To do this, you would need to remove the background from the logo layer.
Knock Out is an important tool for creating images that stand out from the crowd. It allows you to add your own unique spin to an otherwise ordinary photo, and can make even the most mundane subjects look interesting. When used judiciously, Knock Out can help you create images that are truly one-of-a-kind.