For example, an edge might be a contrast between values (the difference between light and dark), colors, textures, or even rhythms (repetition of imagery), without the use of line at all.

例如，边可能是属性值(明暗差异)、颜色、纹理乃至规律(图像反复)的对比，完全与线无关。

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Fields and pastures are light green, in contrast to dark green forest that covers the high-elevation ridges.

农田和牧场为浅绿色部分；而森林覆盖着海拔较高的山脊，这些地方是深绿色的。

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Light and dark areas within an image provide contrast that can suggest volume.

一个图像的明暗区域形成对比，这种对比使图像具有体积感。

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The i2757fh can display 16.7 million colors, while its 50, 000, 000:1 Dynamic Contrast Ratio provides accurate color reproduction when displaying images with extreme differences between light and dark.

ENGADGET: AOC outs 'borderless' 27-inch IPS monitor, available now for $349