PhotoPlus X6 User Guide - Serif

Using PhotoFix masks
Making Image Adjustments 51
Masks in PhotoFix adopt the same principles as layer masks (see p. 27). In
PhotoFix however, masking is used to apply adjustment filters to selected
"painted" regions of your image or to protect painted regions from change.
Painting is used exclusively to create PhotoFix masks.
Each new mask comprises the selected mask region, plus a set of adjustments
applied to that mask. You can change the adjustments associated with the mask
at a later date.
In the first example below, the model's hair has been masked by painting,
allowing White Balance to be adjusted in that painted region only. Conversely,
in the second example, the sky has been painted to protect it from masking,
allowing light levels to be adjusted for Tower Bridge's stonework.
To achieve the above, PhotoFix uses two mask modes, namely Mode Select and
Mode Protect. When you begin masking you'll need to decide which mode you
want to use.