to indicate that a blend range is
being used.In addition to setting the blend mode of a layer, you can set the blend range. This range limits the pixels that the blend mode affects. By default, the blend mode applies to all pixels. Blend ranges set the opacity based on brightness or color channel to drop colors out of the selected layer and make other colors show through.
To set the blend range:
On the Layer palette, select a layer and set its blend mode, see Blending Layers.
Double-click the layer name to open the Layer Properties dialog.
Click the Blend Ranges tab.
In the Blend Channel drop-down list, select a channel to use when blending layers. Select Grey Channel to have the lightness values of layers determine opacity. Select Red Channel, Green Channel, or Blue Channel to have the respective color values determine opacity.
Set the opacity ramp for the channel as follows:
First, drag the upper arrows to indicate the values at which the opacity is 100 percent.
Next, drag the lower arrows to indicate the values at which the opacity is 0 percent.
Note that the values on the left side indicate the ramp up values, while the values on the right side indicate the ramp down values.
For example, in the graphic in the left column, the selected layer’s opacity is 100 percent between lightness values of 43 and 126, and falls off at the lightest and darkest areas.
Click OK.
Paint Shop Pro applies the blend only to the pixels that fall within
the range you selected. The right panel of the Layer palette displays
the Blend Range icon to indicate that a blend range is
being used.
Changing the Opacity of Layers
Cleaning up the Edges of Layers Created from Selections