Screens create color with light (RGB). Printers create color with ink (CMYK). Choosing the right one avoids colors that look different on paper.
Use RGB for screens, websites, social media and most home inkjet printers, which convert colors automatically.
Use CMYK when a print shop asks for it, especially for offset printing. It shows you a closer idea of the colors the press can reproduce.
JPG, TIFF and PDF can be saved in CMYK. PNG, BMP and WEBP only support RGB.
In any PixelEdit Pro tool, choose JPG, TIFF or PDF in the download panel and select CMYK. You can download the same result in RGB too, at no extra credit.