Clipping channels allow you to automatically create masks in images. The remove.bg AI engine will generate the mask. This is an external WebService, so internet and a remove.bg subscription is required for this channel type. The API key that comes with the subscription must be specified in log/maintenance settings. The mask will be added into output Tiff or PSD files as an additional layer. Or the output can be PNG, ready to be used on internet. It does not only do images with a white background but even difficult images like a person in a city environment. See examples below.