AlphaToGrayscaleFilter Class
Copies the alpha channel in the image to the color channels, resulting in a grayscale representation of the alpha channel.
Namespace: Lumia.Imaging.Compositing
Assembly: Lumia.Imaging (in Lumia.Imaging.dll) Version: 255.255.255.255
Syntax
public sealed class AlphaToGrayscaleFilter : IFilter,
__IAlphaToGrayscaleFilterPublicNonVirtuals
'Declaration
Public NotInheritable Class AlphaToGrayscaleFilter
Implements IFilter, __IAlphaToGrayscaleFilterPublicNonVirtuals
public ref class AlphaToGrayscaleFilter sealed : IFilter,
__IAlphaToGrayscaleFilterPublicNonVirtuals
Lumia.Imaging.Compositing.AlphaToGrayscaleFilter = function();
Type.createClass(
'Lumia.Imaging.Compositing.AlphaToGrayscaleFilter',
null,
Lumia.Imaging.IFilter,
Lumia.Imaging.Compositing.__IAlphaToGrayscaleFilterPublicNonVirtuals);
Remarks
The alpha information is no longer present in the output.
This filter is primarily intended for conversion of an alpha based mask to a grayscale mask suitable for use with ImageFusionFilter or BlendFilter.
Examples
This sample loads image with alpha channel and applies the filter to it
using (var filterEffect = new FilterEffect(source))
{
// Initialize the filter and add the filter to the FilterEffect collection
var filter = new AlphaToGrayscaleFilter();
filterEffect.Filters = new IFilter[] { filter };
// Create a target where the filtered image will be rendered to
var target = new WriteableBitmap(width, height);
// Create a new renderer which outputs WriteableBitmaps
using (var renderer = new WriteableBitmapRenderer(filterEffect, target))
{
// Render the image with the filter(s)
await renderer.RenderAsync();
// Set the output image to Image control as a source
ImageControl.Source = target;
}
await SaveEffectAsync(filterEffect, "AlphaToGrayscaleFilter.jpg", outputImageSize);
}
Inheritance Hierarchy
System.Object
Lumia.Imaging.Compositing.AlphaToGrayscaleFilter
Version Information
Lumia Imaging SDK
Supported in: 2.0