Distinguishing Hand Drawing Style Based on Multilevel Analytics Framework

Table 1

Example images and factor of brushwork.

Tools’ class	Background and characteristics
Pen and ink	Pen and ink sketching, which is mainly composed of clear edge lines with a single color, is obviously different from other techniques. Features include edges, high gradients, intensity contrast, lightness contrast, and inhomogeneous.
Felt-tip markers	Felt-tip marker paintings have regular and gorgeous colors of thick lines, and color overlay can obtain rich color changes. Different texture, light, and shade relations require broad brushes to draw in different orders and strength. Features include rich color, high gradients, roughness, intensity, hue contrast, and directionality.
Colored pencils	Colored pencils can create rich color change, appropriate for mixing other colors in a large area of monochromatic which can enhance the color level of the sketch. The brushwork is ethereal, delicate, and exquisite. Features include edges, high gradients, often directional, low hue contrast, and high intensity and contrast.
Watercolors	Watercolor brushwork has a low degree of saturation and smooth texture because of the water used as medium mixed color. When overlaying colors, the underlying color will become distinct, bright, and well arranged. Features include soft gradients, low intensity, intensity contrast, hue contrast, and directionality, homogeneous, small gradients.