Photos or other digital art can be split into two or more colors when they are broken up into two or more parts. CMYK, which stands for cyan, magenta, yellow, and key colors, is how they are usually broken down (Black). Each of these layers is used for color-processing printing on its own.
Depending on the needs and requirements of their projects, designers and screen printers use a lot of different ways to separate things. If you want to be a good designer, you need to know about the four basic types of color separations. They're all here.
It may not be too much of a stretch to say that spot color is the most common way to separate color in making vector art. In offset printing, ink is used to print color on one piece of paper at a time. This is called "offset printing." CorelDraw or Illustrator are usually used to make the separation method of spot color.
The subtractive color model used in the color process or four-color process is called CMYK. It has four key colors: cyan, magenta, yellow, and black, CMYK. As in, ideal CMYK inks take away all of the colors from white light. That leaves only the color of CMYK.
Even though Photoshop can make both four-color process and simulated-process colors, it doesn't make them both. The only thing that's different is that it's the CMYK model, which is more advanced than the old four-color process. Simulated color is a process that uses a wide range of colors to make very detailed pictures. They make high-quality images that look more like they were taken with a camera than with the standard four-color process.
On the other hand, index color doesn't use halftone dots to make color shading and images. Instead, it has square pixels. Adopting this method is the main reason to use it. It will help you manage and organize digital images in a way that will save space and computer memory. Because of this, they are used the most in personal computers today. It can also be said that the process of color separation is done in Photoshop, which can be easily exported to other image-making programs (CorelDraw or Illustrator).