Color Theory Resources

Mixing primary colors together will give you secondary colors. Mixing primary and secondary colors together will give you tertiary colors.

"The reason we perceive certain colors as being either warm or cool has much more to do with psychology rather than physics. There are many psychological triggers which influence how we perceive colors. We generally associate blue with "cool" things such as water, ice and a clear blue sky. On the other hand, we generally associate red with "warm" things such as fire, blood or a sunset.

As an artist, I prefer to think about color temperature in relative terms, rather than absolute terms. This is because colors cannot exist by themselves. You can only identify a color if you have another color to compare it to.

Saying that blue is a cool color is just not a helpful statement. Sure, when compared to red, it does appear to be a cool color. But what happens when you place that blue next to another blue? Are both blues the same temperature, or is one cool and the other warm in relation to each other?"

https://drawpaintacademy.com/what-is-color-temperature/

Hue is a pure color. By adding white to a hue, you create a tint; adding grey to a hue creates a tone; and adding black to a hue creates a shade.

Opacity is used to describe how much light can pass through an object or color, ranging from transparent through translucent to opaque. A substance or color that is translucent lets some light pass through making it partially see-through, and an object or substance that is transparent lets a lot of light through, giving the appearance of it being totally see-through. An opaque substance does not let any light pass through at all (solid color). This effect in art is most noticeable when you can see other things through a color or object.

Gradients are a gradual blending of two (or more) pure colors together, creating a transition in the middle.