图像像素滑块效果不起作用

Question

我正在为图像使用 PixelShader 效果。

1. 使用SLIDERS 调整对比度、亮度、CMY 和 RGB 的图像效果
2. 混合模式图像效果预定义并加载在组合框中，用户可以选择自己的选择。

这是 Image 元素，调整对比度、亮度、CMY 和 RGB 的图像效果以这种方式应用。

<Viewbox  x:Name="cImage" Stretch="Uniform"  Grid.Column="1" Grid.Row="1" Grid.RowSpan="2" Margin="0" >
    <Image x:Name="ViewedPhoto"   Source="IMG_0071.jpg" 
    Stretch="None" VerticalAlignment="Top" HorizontalAlignment="Left"  Margin="0,5,0,95" >
        <Image.Effect>
            <l:BrightContrastEffect 
            Brightness="{Binding Value, ElementName=bVal}"
            Contrast="{Binding Value, ElementName=cVal}"
            Red="{Binding Value, ElementName=rVal}"
            Green="{Binding Value, ElementName=gVal}"
            Blue="{Binding Value, ElementName=blVal}"
        />

        </Image.Effect>
    </Image>
</Viewbox>

亮度滑块：

    <Slider Maximum="1" Minimum="-1"  x:Name="bVal"  TickFrequency="1" TickPlacement="BottomRight"  />
<StackPanel Orientation="Horizontal">
                <TextBox Text="{Binding Value, ElementName=bVal, UpdateSourceTrigger=PropertyChanged}"  TextAlignment="Right" Width="30"  Height="10" Margin="0" RenderTransformOrigin="-1.167,0.423" Visibility="Hidden"/>
</StackPanel>

当我移动用于调整对比度、亮度、CMY 和 RGB 的滑块时，it's working。

我使用组合框应用预定义的混合模式图像效果。

<ComboBox x:Name="cColorEffects"  SelectionChanged="cColorEffects_SelectionChanged" />

为了显示不同的效果，我首先调用ViewedPhoto.Effect = null;，然后应用选定的效果。

if (cColorEffects.SelectedIndex == 0)
{
    ViewedPhoto.Effect = null;
    ViewedPhoto.Effect = new AverageEffect();
}
if (cColorEffects.SelectedIndex == 1)
{
    ViewedPhoto.Effect = null;
    ViewedPhoto.Effect = new ColorBurnEffect();
}

问题：

1. 我正在通过组合框调用另一个图像效果，因此用于调整对比度、亮度、CMY 和 RGB 的图像效果不起作用。

2. 我正在使用ViewedPhoto.Effect = null; 调整对比度、亮度、CMY 和 RGB 的图像效果不起作用。

我想制作the sliders working for adjusting 对比度、亮度、CMY 和RGB 以及apply the blend mode image effects simultaneously。我怎样才能解决这个问题？或者给我一个解决这个问题的想法？

编辑：

我一直在想我可以让滑块以编程方式绑定和图像效果。是否有意义？如果好的话；我该如何应用这个？

<Image x:Name="ViewedPhoto"   >
    <Image.Effect>
        <l:BrightContrastEffect 
        Brightness="{Binding Value, ElementName=bVal}"
        Contrast="{Binding Value, ElementName=cVal}"
        Red="{Binding Value, ElementName=rVal}"
        Green="{Binding Value, ElementName=gVal}"
        Blue="{Binding Value, ElementName=blVal}"
    />

    </Image.Effect>
</Image>

<Slider Maximum="1" Minimum="-1"  x:Name="bVal"  TickFrequency="1" TickPlacement="BottomRight"  />
<StackPanel Orientation="Horizontal">
    <TextBox Text="{Binding Value, ElementName=bVal, UpdateSourceTrigger=PropertyChanged}"  Visibility="Hidden"/>
    <Button x:Name="bReset" Content="R" Height="10" Width="30" Margin="35,0,0,0" Click="bReset_Click"/>
</StackPanel>

<Slider Maximum="1" Minimum="-1" x:Name="cVal" TickFrequency="1" TickPlacement="BottomRight" />
<StackPanel Orientation="Horizontal">
    <TextBox Text="{Binding Value, ElementName=cVal, UpdateSourceTrigger=PropertyChanged}"    Visibility="Hidden" />
    <Button x:Name="cReset" Content="R" Height="10" Width="30" Margin="35,0,0,0" Click="cReset_Click"/>
</StackPanel>

带有代码的其他信息：

 public class BlendModeEffect : ShaderEffect
    {
        public BlendModeEffect()
        {
            UpdateShaderValue(InputProperty);
            UpdateShaderValue(TextureProperty);
        }

        public Brush Input
        {
            get { return (Brush)GetValue(InputProperty); }
            set { SetValue(InputProperty, value); }
        }
        public static readonly DependencyProperty InputProperty =
            ShaderEffect.RegisterPixelShaderSamplerProperty
            (
                "Input",
                typeof(BlendModeEffect),
                0
            );

        public Brush Texture
        {
            get { return (Brush)GetValue(TextureProperty); }
            set { SetValue(TextureProperty, value); }
        }
        public static readonly DependencyProperty TextureProperty =
            ShaderEffect.RegisterPixelShaderSamplerProperty
            (
                "Texture",
                typeof(BlendModeEffect),
                1
            );
    }
//Contrast, Brightness, CMY & RGB Effect
  public class BrightContrastEffect : ShaderEffect
    {
        private static PixelShader m_shader =
            new PixelShader() { UriSource = MakePackUri("bricon.ps") };

        public BrightContrastEffect()
        {


            PixelShader = m_shader;
            UpdateShaderValue(InputProperty);
            UpdateShaderValue(BrightnessProperty);
            UpdateShaderValue(ContrastProperty);
            UpdateShaderValue(RedProperty);
            UpdateShaderValue(GreenProperty);
            UpdateShaderValue(BlueProperty);

        }

        // MakePackUri is a utility method for computing a pack uri 
        // for the given resource.  
        public static Uri MakePackUri(string relativeFile)
        {
            Assembly a = typeof(BrightContrastEffect).Assembly;

            // Extract the short name. 
            string assemblyShortName = a.ToString().Split(',')[0];

            string uriString = "pack://application:,,,/" +
                assemblyShortName +
                ";component/" +
                relativeFile;

            return new Uri(uriString);
        }

        public Brush Input
        {
            get { return (Brush)GetValue(InputProperty); }
            set { SetValue(InputProperty, value); }
        }

        public static readonly DependencyProperty InputProperty = ShaderEffect.RegisterPixelShaderSamplerProperty("Input", typeof(BrightContrastEffect), 0);

        public float Brightness
        {
            get { return (float)GetValue(BrightnessProperty); }
            set { SetValue(BrightnessProperty, value); }
        }

        public static readonly DependencyProperty BrightnessProperty = DependencyProperty.Register("Brightness", typeof(double), typeof(BrightContrastEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(0)));

        public float Contrast
        {
            get { return (float)GetValue(ContrastProperty); }
            set { SetValue(ContrastProperty, value); }
        }

        public static readonly DependencyProperty ContrastProperty = DependencyProperty.Register("Contrast", typeof(double), typeof(BrightContrastEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(1)));


        public float Red
        {
            get { return (float)GetValue(RedProperty); }
            set { SetValue(RedProperty, value); }
        }

        public static readonly DependencyProperty RedProperty = DependencyProperty.Register("Red", typeof(double), typeof(BrightContrastEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(2)));

        public float Green
        {
            get { return (float)GetValue(GreenProperty); }
            set { SetValue(RedProperty, value); }
        }

        public static readonly DependencyProperty GreenProperty = DependencyProperty.Register("Green", typeof(double), typeof(BrightContrastEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(3)));

        public float Blue
        {
            get { return (float)GetValue(BlueProperty); }
            set { SetValue(BlueProperty, value); }
        }

        public static readonly DependencyProperty BlueProperty = DependencyProperty.Register("Blue", typeof(double), typeof(BrightContrastEffect), new UIPropertyMetadata(0.0, PixelShaderConstantCallback(4)));

        //private static PixelShader m_shader = new PixelShader() { UriSource = new Uri(@"pack://application:,,,/CustomPixelRender;component/bricon.ps") };

    }

//Average Blend Mode Effect
 public class AverageEffect : BlendModeEffect
    {
        public static Uri MakePackUri(string relativeFile)
        {
            Assembly a = typeof(ColorBurnEffect).Assembly;

            // Extract the short name. 
            string assemblyShortName = a.ToString().Split(',')[0];

            string uriString = "pack://application:,,,/" +
                assemblyShortName +
                ";component/" +
                relativeFile;

            return new Uri(uriString);
        }
        static AverageEffect()
        {
            _pixelShader.UriSource = MakePackUri("AverageEffect.ps");
        }

        public AverageEffect()
        {
            this.PixelShader = _pixelShader;
        }

        private static PixelShader _pixelShader = new PixelShader();
    }

//ColorBurn Effect
  public class ColorDodgeEffect : BlendModeEffect
    {
        public static Uri MakePackUri(string relativeFile)
        {
            Assembly a = typeof(ColorBurnEffect).Assembly;

            // Extract the short name. 
            string assemblyShortName = a.ToString().Split(',')[0];

            string uriString = "pack://application:,,,/" +
                assemblyShortName +
                ";component/" +
                relativeFile;

            return new Uri(uriString);
        }
        static ColorDodgeEffect()
        {
            _pixelShader.UriSource = MakePackUri("ColorDodgeEffect.ps");
        }

        public ColorDodgeEffect()
        {
            this.PixelShader = _pixelShader;
        }

        private static PixelShader _pixelShader = new PixelShader();
    }

//BlendModeEffect
  public class BlendModeEffect : ShaderEffect
    {
        public BlendModeEffect()
        {
            UpdateShaderValue(InputProperty);
            UpdateShaderValue(TextureProperty);
        }

        public Brush Input
        {
            get { return (Brush)GetValue(InputProperty); }
            set { SetValue(InputProperty, value); }
        }
        public static readonly DependencyProperty InputProperty =
            ShaderEffect.RegisterPixelShaderSamplerProperty
            (
                "Input",
                typeof(BlendModeEffect),
                0
            );

        public Brush Texture
        {
            get { return (Brush)GetValue(TextureProperty); }
            set { SetValue(TextureProperty, value); }
        }
        public static readonly DependencyProperty TextureProperty =
            ShaderEffect.RegisterPixelShaderSamplerProperty
            (
                "Texture",
                typeof(BlendModeEffect),
                1
            );
    }

Answer 1

根据 SO 聊天使用建议。我已将 BrightContrastEffect 称为滑块更改事件处理程序中图像的新效果。我以编程方式设置投标值。

private void cVal_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
{
   cColorEffects.SelectedIndex = 0;
   BrightContrastEffect bce = new BrightContrastEffect();
   BindingOperations.SetBinding(bce, BrightContrastEffect.ContrastProperty, new        Binding("Value") { Source = cVal });
ViewedPhoto.Effect = bce;
}

我对其他滑块应用了相同的方法。