Again, let me reiterate that we are trying to help you, but you really need to answer the specific questions that you were asked.
Let's start with this one: What exactly do you mean by "3 colors". Larry (ALB) tried to guess and illustrated one interpretation of the phrase, "3 colors", namely, different areas have different colors.
However, from what you said, I suspect that you may mean something different. For example, the phrase could also mean that any given color could be broken apart into three primary colors such as R, G, and B, or C, M, and Y. What do you mean?
Next, please answer Larry's question: What is the end use of the file you are trying to create? Are you going to post it on the web? Are you going to print it? If you are going to print it, what method are you going to use? Your own inkjet, a small company, or a large, high volume commercial printer, e.g., using an offset press?
Tom