回答編集履歴
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見直しキャンペーン中
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普通に考えるとこの辺を使って、アルファを反転させた画像を作るんでしょうね。
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[BitmapSource.CopyPixels メソッド (System.Windows.Media.Imaging) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.media.imaging.bitmapsource.copypixels?view=net-6.0)
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[WPFにおける画像のピクセル値への高速アクセス - Qiita](https://qiita.com/MaruiMisato/items/b350979f35bc0e9e0f51)
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わたしはこういった(めんどくさそうな)ことは嫌いなので、調べている途中で見たこれでやってみました。
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[wpf - How to Invert Color of XAML PNG Images using C#? - Stack Overflow](https://stackoverflow.com/questions/45093399/how-to-invert-color-of-xaml-png-images-using-c)
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注)私はシェーダーについて何ひとつわかっていません。
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```x
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```xml
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<Window
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x:Class="Questions374313.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:local="clr-namespace:Questions374313"
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Width="800"
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Height="450"
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Background="MistyRose">
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<Window.Resources>
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<!--<BitmapImage x:Key="original" UriSource="orange.png" />-->
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<!-- オレンジ画像を使う場合↑を生かして、↓をコメント化 -->
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<DrawingImage x:Key="original">
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<DrawingImage.Drawing>
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<DrawingGroup>
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<GeometryDrawing Brush="Transparent">
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<GeometryDrawing.Geometry>
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<RectangleGeometry Rect="0,0,300,277" />
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</GeometryDrawing.Geometry>
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</GeometryDrawing>
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<GeometryDrawing>
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<GeometryDrawing.Geometry>
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<GeometryGroup>
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<EllipseGeometry
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Center="150,138.5"
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RadiusX="140"
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RadiusY="100">
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<EllipseGeometry.Transform>
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<TransformGroup>
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<ScaleTransform CenterX="150" CenterY="138.5" />
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<SkewTransform CenterX="150" CenterY="138.5" />
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<RotateTransform Angle="140" CenterX="150" CenterY="138.5" />
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<TranslateTransform />
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</TransformGroup>
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</EllipseGeometry.Transform>
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</EllipseGeometry>
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</GeometryGroup>
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</GeometryDrawing.Geometry>
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<GeometryDrawing.Brush>
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<LinearGradientBrush>
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<GradientStop Offset="0.0" Color="#FFDD6200" />
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<GradientStop Offset="1.0" Color="#0000" />
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</LinearGradientBrush>
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</GeometryDrawing.Brush>
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<GeometryDrawing.Pen>
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<Pen Brush="#FFFFD250" Thickness="20" />
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</GeometryDrawing.Pen>
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</GeometryDrawing>
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</DrawingGroup>
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</DrawingImage.Drawing>
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</DrawingImage>
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<Image x:Key="invert" Source="{StaticResource original}">
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<Image.Effect>
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<local:InvertEffect />
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</Image.Effect>
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</Image>
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</Window.Resources>
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<UniformGrid
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HorizontalAlignment="Left"
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VerticalAlignment="Top"
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Rows="1">
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<UniformGrid.Resources>
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<Style TargetType="Rectangle">
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<Setter Property="Width" Value="300" />
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<Setter Property="Height" Value="277" />
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<Setter Property="Fill" Value="Blue" />
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</Style>
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</UniformGrid.Resources>
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<GroupBox Header="original">
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<Image Source="{StaticResource original}" />
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</GroupBox>
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<GroupBox Header="original - OpacityMask">
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<Viewbox>
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<Rectangle>
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<Rectangle.OpacityMask>
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<ImageBrush ImageSource="{StaticResource original}" />
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</Rectangle.OpacityMask>
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</Rectangle>
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</Viewbox>
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</GroupBox>
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<GroupBox Header="fake">
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<Viewbox>
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<Grid>
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<Rectangle />
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<Rectangle Fill="White">
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<Rectangle.OpacityMask>
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<ImageBrush ImageSource="{StaticResource original}" />
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</Rectangle.OpacityMask>
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</Rectangle>
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</Grid>
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</Viewbox>
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</GroupBox>
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<GroupBox Header="invert - OpacityMask">
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<Viewbox>
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<Rectangle>
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<Rectangle.OpacityMask>
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<VisualBrush Visual="{StaticResource invert}" />
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</Rectangle.OpacityMask>
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</Rectangle>
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</Viewbox>
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</GroupBox>
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</UniformGrid>
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</Window>
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```
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```
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```cs
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using System;
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using System.IO;
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using System.Windows;
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using System.Windows.Media;
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using System.Windows.Media.Effects;
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namespace Questions374313
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{
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public partial class MainWindow : Window
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{
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public MainWindow() => InitializeComponent();
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}
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// [wpf - How to Invert Color of XAML PNG Images using C#? - Stack Overflow](https://stackoverflow.com/questions/45093399/how-to-invert-color-of-xaml-png-images-using-c)
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internal class InvertEffect : ShaderEffect
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{
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public Brush Input { get => (Brush)GetValue(InputProperty); set => SetValue(InputProperty, value); }
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public static readonly DependencyProperty InputProperty = RegisterPixelShaderSamplerProperty("Input", typeof(InvertEffect), 0);
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private const string _kshaderAsBase64 = @"AAP///7/HwBDVEFCHAAAAE8AAAAAA///AQAAABwAAAAAAQAASAAAADAAAAADAAAAAQACADgAAAAAAAAAaW5wdXQAq6sEAAwAAQABAAEAAAAAAAAAcHNfM18wAE1pY3Jvc29mdCAoUikgSExTTCBTaGFkZXIgQ29tcGlsZXIgMTAuMQCrUQAABQAAD6AAAIA/AAAAAAAAAAAAAAAAHwAAAgUAAIAAAAOQHwAAAgAAAJAACA+gQgAAAwAAD4AAAOSQAAjkoAIAAAMAAAiAAAD/gQAAAKAFAAADAAgHgAAA/4AAAOSAAQAAAgAICIAAAP+A//8AAA==";
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private static readonly PixelShader _shader;
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static InvertEffect()
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{
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_shader = new PixelShader();
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_shader.SetStreamSource(new MemoryStream(Convert.FromBase64String(_kshaderAsBase64)));
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}
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public InvertEffect()
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{
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PixelShader = _shader;
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UpdateShaderValue(InputProperty);
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}
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}
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}
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```
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```HLSL
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sampler2D input : register(s0);
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float4 main(float2 uv : TEXCOORD) : COLOR
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{
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float4 color = tex2D(input, uv);
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float alpha = 1 - color.a;
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// color = 1 - color;
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color.a = alpha;
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color.rgb *= alpha;
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return color;
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}
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```
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ぶっちゃけシェーダーなら何でもありみたいなものでしょうから、こんな回りくどいことをしなくてももっと直接適用できるでしょうが^^;
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![アプリ画像](d90addbe0f36f8336603b85e99a4bbe4.png)
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---
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途中まで調べていたので回答しましたが、「特に意味はない」と言われてしまうと萎えますね^^;
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仮絵(`DrawingImage`)を作るのが、一番時間がかかりましたw
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