ImageAttributes.SetOutputChannel 方法

参考

定义

命名空间:: System.Drawing.Imaging

程序集:: System.Drawing.Common.dll

程序集:: System.Drawing.dll

包:: System.Drawing.Common v6.0.0

包:: System.Drawing.Common v7.0.0

包:: System.Drawing.Common v8.0.0

包:: System.Drawing.Common v9.0.0-preview.2.24128.3

重要

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设置 CMYK（青色-洋红色-黄色-黑色）输出通道。

重载

SetOutputChannel(ColorChannelFlag)	为默认类别设置 CMYK（青色-洋红色-黄色-黑色）输出通道。
SetOutputChannel(ColorChannelFlag, ColorAdjustType)	为指定的类别设置 CMYK（青色-洋红色-黄色-黑色）输出通道。

SetOutputChannel(ColorChannelFlag)

Source:: ImageAttributes.cs

Source:: ImageAttributes.cs

Source:: ImageAttributes.cs

为默认类别设置 CMYK（青色-洋红色-黄色-黑色）输出通道。

public:
 void SetOutputChannel(System::Drawing::Imaging::ColorChannelFlag flags);

public void SetOutputChannel (System.Drawing.Imaging.ColorChannelFlag flags);

member this.SetOutputChannel : System.Drawing.Imaging.ColorChannelFlag -> unit

Public Sub SetOutputChannel (flags As ColorChannelFlag)

参数

flags: ColorChannelFlag

ColorChannelFlag 的一个元素，指定输出通道。

示例

下面的代码示例演示如何使用 SetOutputChannel 方法。若要运行此示例，请将以下代码粘贴到 Windows 窗体中。处理窗体的事件 Paint 并调用 ShowOutputChannels，作为 ePaintEventArgs传递。

private void ShowOutputChannels(PaintEventArgs e)
{
    //Create a bitmap from a file.
    Bitmap bmp1 = new Bitmap("c:\\fakePhoto.jpg");

    // Create a new bitmap from the original, resizing it for this example.
    Bitmap bmp2 = new Bitmap(bmp1, new Size(80, 80));

    bmp1.Dispose();

    // Create an ImageAttributes object.
    ImageAttributes imgAttributes = new ImageAttributes();

    // Draw the image unaltered.
    e.Graphics.DrawImage(bmp2, 10, 10);

    // Draw the image, showing the intensity of the cyan channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelC,
        System.Drawing.Imaging.ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(bmp2, new Rectangle(100, 10, bmp2.Width, bmp2.Height),
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    // Draw the image, showing the intensity of the magenta channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelM,
        ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(bmp2, new Rectangle(10, 100, bmp2.Width, bmp2.Height),
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    // Draw the image, showing the intensity of the yellow channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelY,
        ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(bmp2, new Rectangle(100, 100, bmp2.Width, bmp2.Height), 0, 0,
        bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    // Draw the image, showing the intensity of the black channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelK,

        System.Drawing.Imaging.ColorAdjustType.Bitmap);
    e.Graphics.DrawImage(bmp2, new Rectangle(10, 190, bmp2.Width, bmp2.Height),
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    //Dispose of the bitmap.
    bmp2.Dispose();
}

Private Sub ShowOutputChannels(ByVal e As PaintEventArgs)

    'Create a bitmap from a file.
    Dim bmp1 As New Bitmap("c:\fakePhoto.jpg")

    ' Create a new bitmap from the original, resizing it for this example.
    Dim bmp2 As New Bitmap(bmp1, New Size(80, 80))

    bmp1.Dispose()

    ' Create an ImageAttributes object.
    Dim imgAttributes As New System.Drawing.Imaging.ImageAttributes()

    ' Draw the image unaltered.
    e.Graphics.DrawImage(bmp2, 10, 10)

    ' Draw the image, showing the intensity of the cyan channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelC, ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(100, 10, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    ' Draw the image, showing the intensity of the magenta channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelM, ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(10, 100, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    ' Draw the image, showing the intensity of the yellow channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelY, _
        ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(100, 100, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    ' Draw the image, showing the intensity of the black channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelK, _
        ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(10, 190, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    'Dispose of the bitmap.
    bmp2.Dispose()

End Sub

注解

可以使用 SetOutputChannel 方法将图像转换为 CMYK 颜色空间，并检查其中一个 CMYK 颜色通道的强度。例如，假设创建对象 ImageAttributes 并将其位图输出通道设置为 ColorChannelC。如果将该 ImageAttributes 对象的路径传递给 DrawImage 方法，则计算每个像素的青色分量，呈现的图像中的每个像素都是灰色阴影，指示其青色通道的强度。同样，可以呈现指示洋红色、黄色和黑色通道强度的图像。

对象维护五个 ImageAttributes 调整类别的颜色和灰度设置：默认、位图、画笔、笔和文本。例如，可以为默认类别指定输出通道，为位图类别指定其他输出通道。

默认颜色调整和灰度调整设置适用于没有自己调整设置的所有类别。例如，如果从未为位图类别指定任何调整设置，则默认设置将应用于位图类别。

适用于

SetOutputChannel(ColorChannelFlag, ColorAdjustType)

Source:: ImageAttributes.cs

Source:: ImageAttributes.cs

Source:: ImageAttributes.cs

为指定的类别设置 CMYK（青色-洋红色-黄色-黑色）输出通道。

public:
 void SetOutputChannel(System::Drawing::Imaging::ColorChannelFlag flags, System::Drawing::Imaging::ColorAdjustType type);

public void SetOutputChannel (System.Drawing.Imaging.ColorChannelFlag flags, System.Drawing.Imaging.ColorAdjustType type);

member this.SetOutputChannel : System.Drawing.Imaging.ColorChannelFlag * System.Drawing.Imaging.ColorAdjustType -> unit

Public Sub SetOutputChannel (flags As ColorChannelFlag, type As ColorAdjustType)

参数

flags: ColorChannelFlag

ColorChannelFlag 的一个元素，指定输出通道。

type: ColorAdjustType

ColorAdjustType 的一个元素，指定将设置输出通道的类别。

示例

private void ShowOutputChannels(PaintEventArgs e)
{
    //Create a bitmap from a file.
    Bitmap bmp1 = new Bitmap("c:\\fakePhoto.jpg");

    // Create a new bitmap from the original, resizing it for this example.
    Bitmap bmp2 = new Bitmap(bmp1, new Size(80, 80));

    bmp1.Dispose();

    // Create an ImageAttributes object.
    ImageAttributes imgAttributes = new ImageAttributes();

    // Draw the image unaltered.
    e.Graphics.DrawImage(bmp2, 10, 10);

    // Draw the image, showing the intensity of the cyan channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelC,
        System.Drawing.Imaging.ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(bmp2, new Rectangle(100, 10, bmp2.Width, bmp2.Height),
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    // Draw the image, showing the intensity of the magenta channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelM,
        ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(bmp2, new Rectangle(10, 100, bmp2.Width, bmp2.Height),
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    // Draw the image, showing the intensity of the yellow channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelY,
        ColorAdjustType.Bitmap);

    e.Graphics.DrawImage(bmp2, new Rectangle(100, 100, bmp2.Width, bmp2.Height), 0, 0,
        bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    // Draw the image, showing the intensity of the black channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelK,

        System.Drawing.Imaging.ColorAdjustType.Bitmap);
    e.Graphics.DrawImage(bmp2, new Rectangle(10, 190, bmp2.Width, bmp2.Height),
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes);

    //Dispose of the bitmap.
    bmp2.Dispose();
}

Private Sub ShowOutputChannels(ByVal e As PaintEventArgs)

    'Create a bitmap from a file.
    Dim bmp1 As New Bitmap("c:\fakePhoto.jpg")

    ' Create a new bitmap from the original, resizing it for this example.
    Dim bmp2 As New Bitmap(bmp1, New Size(80, 80))

    bmp1.Dispose()

    ' Create an ImageAttributes object.
    Dim imgAttributes As New System.Drawing.Imaging.ImageAttributes()

    ' Draw the image unaltered.
    e.Graphics.DrawImage(bmp2, 10, 10)

    ' Draw the image, showing the intensity of the cyan channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelC, ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(100, 10, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    ' Draw the image, showing the intensity of the magenta channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelM, ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(10, 100, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    ' Draw the image, showing the intensity of the yellow channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelY, _
        ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(100, 100, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    ' Draw the image, showing the intensity of the black channel.
    imgAttributes.SetOutputChannel(ColorChannelFlag.ColorChannelK, _
        ColorAdjustType.Bitmap)

    e.Graphics.DrawImage(bmp2, New Rectangle(10, 190, bmp2.Width, bmp2.Height), _
        0, 0, bmp2.Width, bmp2.Height, GraphicsUnit.Pixel, imgAttributes)

    'Dispose of the bitmap.
    bmp2.Dispose()

End Sub

注解

默认颜色调整和灰度调整设置适用于没有自己调整设置的所有类别。例如，如果从未为位图类别指定任何调整设置，则默认设置将应用于位图类别。

为特定类别指定颜色调整或灰度调整设置后，默认调整设置将不再应用于该类别。例如，假设为默认类别指定调整设置的集合。如果通过传递给 Bitmap SetOutputChannel 方法设置位图类别的输出通道，则默认调整设置都不会应用于位图。

适用于

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