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Shading alters the colors of faces in a 3D model based on the angle of the surface to a light source or light sources. The first image below has the faces of the box rendered, but all in the same color. Edge lines have been rendered here as well which makes the image easier to see. The second image is the same model rendered without edge lines.
He described sfumato as "without lines or borders, in the manner of smoke". [ 1 ] According to the theory of the art historian Marcia B. Hall , [ 2 ] which has gained considerable acceptance, [ 3 ] sfumato is one of four modes of painting colours available to Italian High Renaissance painters, along with cangiante , chiaroscuro , and unione .
Line art or line drawing is any image that consists of distinct straight lines or curved lines placed against a background (usually plain). Two-dimensional or three-dimensional objects are often represented through shade (darkness) or hue . Line art can use lines of different colors, although line art is usually monochromatic.
Christ at Rest, by Hans Holbein the Younger, 1519, a chiaroscuro drawing using pen, ink, and brush, washes, white heightening, on ochre prepared paper. The term chiaroscuro originated during the Renaissance as drawing on coloured paper, where the artist worked from the paper's base tone toward light using white gouache, and toward dark using ink, bodycolour or watercolour.
A line drawing is the most direct means of expression. This type of drawing without shading or lightness, is usually the first to be attempted by an artist.It may be somewhat limited in effect, yet it conveys dimension, movement, structure and mood; it can also suggest texture to some extent.
The great defect of all the processes of photolithography described in the last section is that they can only be applied with advantage to the reproduction of drawings or subjects in which the gradation of shade is shown by lines or dots separated by white spaces of varying sizes and at varying intervals apart, as in line or stipple engravings ...
These are always engravers' lines, such as may be made naturally with the burin, and they never imitate the freer line of the pencil or etching needle. Shading is used in the greatest moderation with thin straight strokes that never overpower the stronger organic lines of the design. In early metal engraving the shading lines are often cross ...
The artist may exaggerate or create lines, perhaps as part of their message to the viewer. Many lines without a clear subject-point suggest chaos in the image, and may conflict with the mood the artist is trying to evoke. [citation needed] A line's angle and its relationship to the frame's size influence the perspective of the image.