Selecting by Brushing on Masks
Brush based selection is used to extract foregrounds with complex outlines with accuracy. It is also used to refine selections made with other techniques. And it also support transparency (softness).
Erasing is probably the first thing that comes to mind when we talk about brush based selection. But it is not a recommended process at all. Erasing is a destructive process and can permanently damage the original image as recovery is limited only to a number of undo levels we have set.
Brushing with Layer Masks
Here too Layer Masks can be used, to preserve the workflow of Eraser and additional possibility of recovering removed portions if they are needed. Painting on the Layer Mask with a White or Black will reveal or hide the contents respectively. We can brush out backgrounds in the same way as in using the Eraser tool and get it back by painting with White.
No Feedback
When brushing the mask we may sometimes trim off relevant parts accidently and keep focusing on the wrong silhouette only to be discovered later. This is highly probable when foreground background have similar hues and there is no immediate visual feedback.
Immediate Feedback
This problem can be averted by following a simple rule of keeping a multiplied duplicate of the current layer in the background as a guide layer. Multiplied gradient maps will show-up as high contrast versions of the subject outlines if violated.
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