If the Selection Options is set to circle, you can select circular edges or circles as thread geometry.

如果选择选项设置为圆形，你可以选择圆形边缘或界线程几何。

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The selection of the circular edges is available only for single geometry selection.

选择圆形边缘仅适用于单一的几何形状的选择。

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However, making selection can be a painstaking job because many objects don't have clearly defined edges and fade into the background.

然而，决策的选择可以是一个艰苦的工作，因为有很多的物体没有明确界定的优势和褪色成背景。

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Take a tour around the edges of the device and you'll find a far more comprehensive selection of buttons and ports than in the original Fire, a big step forward that shows Amazon listens to criticism.

ENGADGET: Amazon Kindle Fire HD review (7-inch)

If painting the colors back in sounds like hard work, there's also an automatic fill tool to detect edges and colors and either fill in or remove the color automatically from a selection (although we had mixed results using this tool).

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