Create new file 1280 x 1024 px. Create a rectangular selection in the center of the image, hit Q to enter quick mask mode.

建立一张1280*1024的白底画布.然后在画布中间用选框工具建立一个矩形选区 进入快速蒙版模式(Q).

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Create new group for the photo. See picture below for reference on its position. Draw rectangular selection in front of the camera. Click Add Layer Mask icon.

创建新组照片。见自己的立场参考下面的图片。绘制在镜头前矩形选区。点击添加图层蒙板图标。

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The purpose of the mask is to define a rectangular region that gets excluded from detection processing.

的目的，面具是界定一矩形区域得到排除检测处理。

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