As long as the image is seen on the printed matter, it is expressed in CMYK mode. For example, printing baked food packaging, disposable take-out cartons, portable paper bag printing, paper cup printing, pizza box printing, etc., are all printed, then the CMYK mode.
RGB-R (red) G (green) B (blue)
CMYK Color

The difference between CMYK and spot colorCMYK – four colors of cyan, magenta yellow and black. In printing, usually thousands of other colors can be reproduced by these four colors;
spot color – spot color ink refers to a pre-mixed specific color ink (or special pre-mixed ink), used to replace or supplement the printing color (CMYK) ink, such as bright orange, green, fluorescent Color, metal gold and silver ink, etc.. Or it can be bronzing version, embossed version, etc., also used as a partial varnish version, etc. It is not mixed by CMYK four colors, each spot color requires a special plate when printing (It can be easily understood as a spot color film, and a spot color for printing.) Spot colors mean accurate colors.
Different uses of RGB and CMYK colors
As long as the image displayed on the screen is in RGB mode.