Select Image Transparency 选择图像透明度
This transparency will allow the image we are adding the corners to to show through.
这一透明特性可以让我们要叠加角的图像仍可以显示出来。
The remaining two options are the transparency flag and the directory of image tiles.
余下的两个选项是透明标志和图像贴片的目录。
Specify a 0 for the transparency flag to have your final encoding scheme decide what the background image will be.
指定透明标志为0来让最终编码模式决定采用什么样的背景图像。
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