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Hatching () is an artistic technique used to create tonal or shading effects by drawing, painting, or scribing closely spaced parallel lines. When lines are placed at an angle to one another, it is called cross-hatching. Hatching is also sometimes used to encode colours in monochromatic representations of colour images, particularly in heraldry.
Hatching is especially important in essentially linear media, such as drawing and many forms of printmaking, such as engraving, etching, and woodcut. In Western art, hatching originated in the Middle Ages and developed further into cross-hatching, especially in the old master prints of the fifteenth century. Master ES and Martin Schongauer in engraving and Erhard Reuwich and Michael Wolgemut in woodcut were pioneers of both techniques. Albrecht Dürer in particular perfected the technique of crosshatching in both media.
Artists use the technique by varying the length, angle, closeness, and other qualities of the lines, most commonly in drawing, linear painting, and engraving.
An area of shading next to another area which has lines going in another direction is often used to create contrast.
Line work can be used to represent colors, typically by using the same type of hatch to represent particular tones. For example, red might be made up of lightly spaced lines, whereas green could be made of two layers of perpendicular dense lines, resulting in a realistic image.
Crosshatching is the technique of using line to shade and create value.
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