Harmony is a classic concept that relates to the ideas of beauty, proportion and order. We can also define harmony as the effect of the composition of objects, not randomly, but in a way that properties and intrinsic components of the object in question are solidly respected, according to a varying degree of importance preset that connects with the general scheme of organization of the object itself. Thus, it is understandable to note the intimate relation between form and content, syntax and semantic properties that manifest as real-world sensations linked to the rhythm, the colors, the movement and structural design. This synergy of concepts configures the basis of harmony. In this talk titled "A Gentle Introduction to Color Harmonization Techniques", we will present a brief overview on methods, techniques and applications of color harmonization in images, videos and three-dimensional models, such techniques being extensible to any objects of visual appreciation.