The permissions mask allocates 8 bits each to the four possible types of key accessor: possessor, user, group, and other.
权限掩码给四个可能的密钥访问者类型各分配 8 位：所有者、用户、组和其他。
2
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。
3
Zeng's group of three canvases demonstrates how any marking, any technique, any medium, must mask the image it reveals.