WmpBitmapEncoder.AlphaDataDiscardLevel Property

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)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public byte AlphaDataDiscardLevel { get; set; }
<object AlphaDataDiscardLevel="byte" .../>

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.


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

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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