BitmapAlphaMode Enum


Specifies the alpha mode of pixel data.

public enum class BitmapAlphaMode
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
enum class BitmapAlphaMode
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public enum BitmapAlphaMode
var value = Windows.Graphics.Imaging.BitmapAlphaMode.premultiplied
Public Enum BitmapAlphaMode

Windows requirements

Device family
Windows 10 (introduced in 10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced in v1.0)


Ignore 2

The alpha value is ignored.

Premultiplied 0

The alpha value has been premultiplied. Each color is first scaled by the alpha value.

Straight 1

The alpha value has not been premultiplied. The alpha channel indicates the transparency of the color.


BitmapAlphaMode is used in conjunction with BitmapPixelFormat to describe the pixel data.

Using the Ignore value effectively treats the pixel data as opaque by discarding the alpha channel data. For example, pixel data returned by a decoder with an alpha mode of Ignore and a pixel format of Rgba8 will have alpha channel values of 0.

Applies to

See also