The 3 primary colors are red, blue and yellow. When any 2 of the primary colors are mixed, they create secondary colors. For example, mixing blue and yellow creates green, a secondary color. When a primary color is combined with its nearest secondary color on the color wheel, it creates a tertiary color. For example, when yellow is mixed with orange (one of its adjacent secondary colors), it creates the tertiary color yellow-orange. There are two different color models we covered: subtractive and additive. When we mix colors using paint or through printing, we use the subtractive color method meaning that as one adds color, the results get darker and more black. With the additive color model, adding color results in lighter, whiter results. Different places in the world have different perceptions of different colors because colors have different connotations. If a color is surrounded by light or dark colors, it can change how we see the color.
Here is an example of a greyscale image:
Here is an example of a monochrome image:
Here is an example of an image that uses complementary colors: