WmpBitmapEncoder.AlphaDataDiscardLevel Property


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Gets or sets the level of alpha frequency data to discard during a compressed domain transcode.

Namespace:   System.Windows.Media.Imaging
Assembly:  PresentationCore (in PresentationCore.dll)

public byte AlphaDataDiscardLevel { get; set; }

Property Value

Type: System.Byte

The level of alpha data to discard when encoding the image. The value range is 0 (no data discarded) to 4 (alpha channel completely discarded). The default is 1.




No image frequency data is discarded.


FlexBits are discarded. The image quality of the image is reduced without changing the effective resolution of the image.


HighPass frequency data band is discarded. The image's effective resolution is reduced by a factor of 4 in both dimensions.


HighPass and LowPass frequency data bands are discarded. The image's effective resolution is reduced by a factor of 16 in both dimensions.


The alpha channel is completely discarded. The pixel format is changed to reflect the removal of the alpha channel.

Exception Condition

The value given is not between 0 and 4.

This property has an effect only if CompressedDomainTranscode is set to true and the image contains either a planar or interleaved alpha channel; otherwise, it is ignored.

.NET Framework
Available since 3.0
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