Concept:
Another way of masking using "Hide All"
command where once the mask is applied, the images is completely
covered with the mask, or we can say that it is hidden behind the
mask.
1. Open Photoshop. Open Image to work with "Hide
All" command. Double click and unlock the Background layer.
Check out the detail procedure
here.

2. Layer > Add Layer Mask > Hide All
3. The image is hidden behind the mask. It means you
will find image is covered with mask.
3. Once you click "Hide All" you will find
that foreground and background colors become black & white.
And the layer mask thumbnail added to the image layer.
4. Select any artistic brush. Keep white as a foreground
color.
5.Start painting to reveal the desired area of the
image. Painting with black will hide the area.

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