Four-color matching chart and effect images

Quick answer：

A four-color matching chart typically refers to a visual guide that shows combinations of four primary colors (red, blue, yellow, and black or cyan, magenta, yellow, and black) and their various shades, tints, and tones. These charts are used in graphic design, printing, and other industries to ensure consistent color reproduction. Effect images would be examples of how these color combinations look in practical applications.