It is a key concept in artistic painting (and in aesthetic fields). In general, the spectators feel this harmony, without knowing these technical origins.
Now, a beginner must master the blends of colors to produce a kind of harmony.
The most famous harmonies of colors are: (the artist can innovate a new harmony)
Put in front of you an image, on paper, of the chromatic circle with these primary colors secondary colors, and tertiary colors, a complete box of colored pencils and drawing sheets.
Try to follow the descriptions to imagine and realize the greatest number of color harmonies.
With each harmony, I put for you a small image of painting of my creation, where I used this harmony.
1) Similar harmony:
Results from the mixing of 2, 3 or more colors which lie side by side on the chromatic circle
2) Supplementary Harmony:
The complementary colors are always on the opposite side of the chromatic circle.
Each primary color has a secondary color, as complementary. A tertiary color will have, as complementary, only another tertiary color.
3) Triadic Harmony:
It is formed with 3 colors, which are located at equal distance, on the chromatic circle. (Example: the 3 primary colors form a triadic harmony)
4) Adjacent complementary harmony:
The adjacent colors of a main color are those which are placed in front of it on the chromatic circle.
5) Harmony in square:
It is formed of 4 colors that form a square on the chromatic circle. They have, therefore, even distance between them.
6) Harmony in rectangle:
It is formed by 4 colors, 2 primary and 2 secondary, which form a rectangle, on the chromatic circle.