Gets or sets the alpha channel threshold of a bitmap when converting to palletized formats that recognizes an alpha color.
Assembly: PresentationCore (in PresentationCore.dll)
Thevalue is used to determine what level of opacity will be mapped to the fully transparent color in the converted format. A value of 9.8 implies that any pixel with an alpha value of less than 25 will be mapped to the transparent color. A value of 100 maps all pixels which are not fully opaque to the transparent color.
The destination palette should provide a transparent color; otherwise, the transparent color will be the one closest to zero, often black.
Available since 3.0