RGB and CMYK are two different colour models used in digital and print media.

RGB stands for Red, Green, and Blue, and it is an additive colour model used in digital media. It combines these three primary colours of light to create a wide range of colours. In RGB, black is created by the absence of all three colors, while white is created by the presence of all three colours at full intensity.

CMYK, on the other hand, stands for Cyan, Magenta, Yellow, and Key (black), and it is a subtractive colour model used in print media. In CMYK, colours are created by subtracting (or absorbing) certain colours from white light. For example, cyan absorbs red light, magenta absorbs green light, and yellow absorbs blue light. Black is used to darken the other colours in the printing process, and it is referred to as the "key" colour.

The main difference between RGB and CMYK is that RGB is used for digital media such as websites, digital images, and videos, while CMYK is used for printed media such as flyers, brochures, and magazines. Additionally, RGB has a wider range of colours than CMYK, which means that some colours created in RGB cannot be reproduced accurately in CMYK. This can result in colour shifting or loss of detail when converting RGB images to CMYK for printing.

Printing with a CMYK colour model is a standard method used in the printing industry to produce high-quality printed materials. The CMYK model stands for Cyan, Magenta, Yellow, and Key (Black), which are the four colours used in printing.

In the CMYK colour model, each colour is represented by a percentage value ranging from 0 to 100, where 0 represents no ink of that colour, and 100 represents the maximum amount of ink of that colour. By combining different percentages of these four colours, a wide range of colours can be produced, including full-colour photographs and detailed graphics.

When preparing artwork for printing with the CMYK colour model, it is important to keep in mind that the colours that are visible on a computer screen may not be exactly the same as the printed colours. This is because computer screens use an RGB colour model, which produces colours using different combinations of Red, Green, and Blue light.

To ensure that the printed colours are as accurate as possible, it is recommended to use CMYK colour values when creating artwork intended for print. It is also important to note that some colours, such as bright greens and oranges, may not be accurately reproduced using the CMYK colour model, so it is best to check with the printer to see if any adjustments or colour corrections are needed before finalising the artwork.

Overall, printing with the CMYK colour model is a reliable and standard method used in the printing industry to produce high-quality printed materials with a wide range of colours and details.