Removing the background of a picture or silhouetting an image in a picture.
                                                            
                                                     
                        
                                                
                        
                        
                            A halftone image which is outlined by removing the dots that surround it; also called Silhouette Halftone. to top
                                                            
                                                     
                        
                                                
                        
                        
                            A prepress term used to describe a halftone image in which the background has been removed or replaced to isolate or silhouette the main image. Also referred to as a knockout halftone or silhouette halftone.