Adobe 29180155 - Photoshop Elements 4.0 Tutorial page 357

To constrain editing to part of the mask, select the corresponding pixels.
4. Edit the layer mask:
To remove areas of the adjustment effect or fill, paint the layer mask with black.
To add areas to the adjustment effect or fill, paint the layer mask with white.
To partially remove the adjustment effect or fill so that it shows in various levels of transparency, paint the layer mask with
gray. (Single-click the foreground color swatch in the toolbox to choose a gray shade from the Swatches panel.) The
extent to which the effect or fill is removed depends on the tones of gray you use to paint. Darker shades result in more
transparency; lighter shades in more opacity.
Shift-click the mask thumbnail (the layer's rightmost thumbnail) in the Layers panel to turn off the mask; click the
thumbnail again to turn on the mask.
More Help topics
Apply the Smart Brush tools
About histograms
About selections
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