RGB colors are a mix of the three colors Red, Green, and Blue. RGB is for screen use such as your computer or phone.
CMYK colors are a mix of Cyan, Magenta, Yellow, and Black. CMYK colors are used for printing. If you change a file from RGB to CMYK colors, the final result might be slightly different.
We print our stickers in CMYK colors. CMYK printing is the standard in the industry because it provides a much wider range of colors compared to RGB.
TIP: you can find all the design requirement for your stickers following this link: https://www.stickeryeti.ch/media/docs/default/EN_Stickeryeti_TechnicalRecommendations_02.02.2022.pdf