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Operational definition of sketch: the artistic activity of consciously shaping the shape of objects on the screen carrier by using monochromatic painting tools and according to certain painting principles. Sketch is a variant of sketch.
Sketch is the basis and skeleton of painting; It is also the art of temperance that needs the help of reason most. Beginners must learn to sketch first, and those who sketch well can naturally draw oil paintings well. The origin of sketch usually begins in the Renaissance. In fact, Greek bottle paintings and sculptures have a good sketch foundation. The original sketch is considered as a manuscript of painting. For example, to make a mural, we must first have a draft of the idea, then a draft of the sketch, and at the same time, we must have an accurate sketch of the hand and face. Painting murals is used to not looking at the model, relying entirely on the sketches prepared in advance and the painter's memory.
The element of sketch is a line, but the line does not exist in essence. It only represents the boundaries of objects, colors and planes as the illusion of objects. Until modern times, lines were considered as spontaneous formal elements, independent of the depicted objects.
Sketch is to form the image of an object with lines and draw it on the plane, that is, the line form causes the viewer's association. For example, the angle formed by the intersection of two straight lines can be considered as the boundary of a plane; In addition, adding a third line can create a three-dimensional effect on the screen. Curved lines can symbolize the vault, and intersecting lines can express the depth. People can get an understandable image from the change of lines. Therefore, through the means of lines, simple outlines can be developed into exquisite sketches.
In sketch, lines can be used to distinguish between solid and plane, while color shading is to strengthen and distinguish the relationship between the whole and the part. We can draw the boundary with the beginning, disappearance and interruption of lines to form a plane, or we can let the colors reach the boundary. The thickness of lines can show the changes of objects, and even light and shadow can be shown through the changes of strokes of lines.
The line technique of sketch also needs the assistance of plane technique. When charcoal chalk is used in plane technology, brush wiping can be used in contrast between light and shade. It is more important to use the brush painting method, because the brush can play the width and strength of strokes, and can increase the sense of space and three-dimensional sense. Sketch can also use multi-color brush as the basic material to enhance the sketch effect and artistic quality.