而连续色调和半色调的图像则保存了较多的颜色信息，通常要求较高的颜色分辨率，但对空间分辨率的要求不高。
Comparatively, the regions of continue-tone images blocks or half-tone images blocks are with more color information, usually demand more color resolution, but little space resolution.
水墨画：用毛笔沾溶于水的黑色或深暗颜色绘画有浓淡色调的单色画。复制时，需用半色调方法。
Wash drawing: a drawing made by a brush in washes with a single pigment of black or dark colour soluble in water, to be reproduced by the half-tone process.
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