Corel PaintShop Pro X7, DE User's Guide Page 250

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246 Corel PaintShop Pro X7 User Guide
You can set the following controls when you use the Background
Eraser tool:
Opacity — specifies the level of opacity. A setting of 100% erases
pixels to complete transparency, and a lower setting erases pixels
to partial transparency.
Tolerance — determines how closely the selected pixels match the
sampled pixel. The range of values is 0 to 512. At lower settings,
only pixels with very similar colors are erased. At higher settings,
more pixels are erased. (This option is unavailable if the Auto
Tolerance check box is marked.)
Sharpness —specifies how much the softness of the erased edge
depends on the color difference between the object and the
background. The range of values is 0 to 100. You can use lower
settings when the edges that you are erasing form a gradient (a
more gradual color transition); you can use higher settings when
the edges that you are erasing have a more abrupt color
transition.
Sampling — specifies the basis on which pixels are erased. This
control has the following options:
Once — samples the point at which you first click and then erases
all matching pixels for the duration of the stroke. This setting
erases similar colors and preserves the areas you want to keep.
Continuous — samples continuously and erases all matching
pixels. If the area to erase is quite variable, you can use this option
and set the Step value low, so that the area is sampled frequently
as you erase. The tool can erase any color it encounters, including
foreground colors if the sampled pixel falls into the foreground
area.
BackSwatch — erases all pixels that match the current
background color on the Materials palette
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