альфа

альфа

The graphics state parameter that Quartz uses to determine how to composite newly painted objects to the existing page. At full intensity (alpha =1.0 ), newly painted objects are opaque. At zero intensity, newly painted objects are invisible (alpha =0.0 ).

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行业/领域：软件; 计算机
类别操作系统
Company: Apple
产品： Mac OS X
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