RGB color is the mainstream in tools and software on the web, CMYK is the mainstream in printed matter, but the first three primary colors learned at school are RYB color model of red · yellow · blue.

For the CMYK color scheme, color specifications must be enclosed in quotation marks. For all other color schemes, the quotes are optional. You can freely intermix color-naming schemes in your programs ...

RGB (short for Red, Green, Blue) An RGB color space is any additive color model. The main purpose of the RGB color model is for the sensing, representation, and display of images in electronic systems ...