Four-color design pictures

Quick answer：

Four-color design pictures typically refer to graphics or illustrations that utilize only four colors, often for simplicity or cost-effectiveness in printing. They are commonly used in various fields, including graphic design, advertising, and publishing. The four colors are usually the primary colors: red, blue, yellow, and black (K for key color in CMYK color model). These designs often convey a specific theme or message and can be found in brochures, magazines, and digital media.