c#将半透明图像与背景色合并到新图像中

我需要根据从纯色（背景）和半透明图像合并生成一个新图像。 所有图像都是半透明的，因此都将与纯色混合

我试过：

 private Image BlendImageWithWindowBackgoundColor(Image pImage, float pColorOpacity)
    {
        Image mResult = null;
        if (pImage != null)
        {
            ColorMatrix matrix = new ColorMatrix(new float[][]{
            new float[] {1F, 0, 0, 0, 0},
            new float[] {0, 1F, 0, 0, 0},
            new float[] {0, 0, 1F, 0, 0},
            new float[] {0, 0, 0, pColorOpacity, 0}, //opacity in rage [0 1]
            new float[] {0, 0, 0, 0, 1F}});

            ImageAttributes imageAttributes = new ImageAttributes();
            imageAttributes.SetColorMatrix(matrix);
            imageAttributes.SetWrapMode(WrapMode.TileFlipXY);

            mResult = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);
            Graphics g = Graphics.FromImage(mResult);

            g.Clear(Color.Red); //<--This is the color i want merged as background!
            g.CompositingMode = CompositingMode.SourceCopy;
            g.CompositingQuality = CompositingQuality.HighQuality;

            g.DrawImage(pImage, new Rectangle(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height), 0, 0, pImage.Width, pImage.Height, GraphicsUnit.Pixel, imageAttributes);
        }

        return mResult;

    }

私有图像BlendImageWithWindowBackgoundColor（图像pImage、浮点PCology）
{
图像mResult=null；
如果（pImage！=null）
{
ColorMatrix矩阵=新的ColorMatrix（新浮点[][]{
新浮点[]{1F，0，0，0，0}，
新浮点[]{0，1F，0，0，0}，
新浮点[]{0,0,1F,0,0}，
新浮点[]{0,0,0，pColorOpacity，0}，//rage中的不透明度[0 1]
新浮点[]{0,0,0,0,1F}）；
ImageAttributes ImageAttributes=新的ImageAttributes（）；
设置颜色矩阵（矩阵）；
SetWrapMode（WrapMode.TileFlipXY）；
mResult=新位图（Screen.PrimaryScreen.Bounds.Width、Screen.PrimaryScreen.Bounds.Height、PixelFormat.Format32bppArgb）；
Graphics g=Graphics.FromImage（mResult）；
g、 清除（Color.Red）；//如果要平铺图像，需要使用
TextureBrush
和
Graphics.FillRectangle
而不是
Drawimage
。您的代码应该是：

private void BlendImageWithWindowBackgoundColor( Image pImage, float pColorOpacity ) {
    Image mResult = null;
    Image tempImage = null; //we will set the opacity of pImage to pColorOpacity and copy
                            //it to tempImage 
    if( pImage != null ) {
        Graphics g;

        ColorMatrix matrix = new ColorMatrix( new float[][]{
                new float[] {1F, 0, 0, 0, 0},
                new float[] {0, 1F, 0, 0, 0},
                new float[] {0, 0, 1F, 0, 0},
                new float[] {0, 0, 0, pColorOpacity, 0}, //opacity in rage [0 1]
                new float[] {0, 0, 0, 0, 1F}} );

        ImageAttributes imageAttributes = new ImageAttributes();
        imageAttributes.SetColorMatrix( matrix );

        tempImage = new Bitmap( pImage.Width, pImage.Height, PixelFormat.Format32bppArgb );

        g = Graphics.FromImage( tempImage );
        g.Clear( Color.Transparent );
        //setting pColorOpacity to pImage and drawing to tempImage 
        g.DrawImage( pImage, new Rectangle( 0, 0, tempImage.Width, tempImage.Height ), 
                     0, 0, pImage.Width, pImage.Height, GraphicsUnit.Pixel, imageAttributes );

        g.Dispose();
        g = null;

        //now we will tile the tempImage
        TextureBrush texture = new TextureBrush( tempImage );
        texture.WrapMode = WrapMode.TileFlipXY;

        mResult = new Bitmap( Screen.PrimaryScreen.Bounds.Width,
                              Screen.PrimaryScreen.Bounds.Height,
                              PixelFormat.Format32bppArgb );

        g = Graphics.FromImage( mResult );
        g.Clear( Color.Red ); //<--This is the color i want merged as background!

        g.FillRectangle( texture, new Rectangle( 0, 0, mResult.Width, mResult.Height ) );

        g.Dispose();
        g = null;

        tempImage.Dispose();
        tempImage = null;

    }

    return mResult;

}

private void BlendImageWithWindowBackgoundColor（图像pImage、float pColorOpacity）{
图像mResult=null；
Image tempImage=null；//我们将pImage的不透明度设置为pColorOpacity并复制
//它是临时图像
如果（pImage！=null）{
图形g；
ColorMatrix矩阵=新的ColorMatrix（新浮点[][]{
新浮点[]{1F，0，0，0，0}，
新浮点[]{0，1F，0，0，0}，
新浮点[]{0,0,1F,0,0}，
新浮点[]{0,0,0，pColorOpacity，0}，//rage中的不透明度[0 1]
新浮点[]{0,0,0,0,1F}）；
ImageAttributes ImageAttributes=新的ImageAttributes（）；
设置颜色矩阵（矩阵）；
tempImage=新位图（pImage.Width、pImage.Height、PixelFormat.Format32bppArgb）；
g=图形。FromImage（tempImage）；
g、 透明（彩色、透明）；
//将pColorOpacity设置为pImage并将图形设置为tempImage
g、 DrawImage（pImage，新矩形（0，0，tempImage.Width，tempImage.Height），
0，0，pImage.Width，pImage.Height，GraphicsUnit.Pixel，imageAttributes）；
g、 处置（）；
g=零；
//现在我们将平铺临时图像
TextureBrush纹理=新的TextureBrush（tempImage）；
texture.WrapMode=WrapMode.TileFlipXY；
mResult=新位图（Screen.PrimaryScreen.Bounds.Width，
Screen.PrimaryScreen.Bounds.Height，
PixelFormat.Format32bppArgb）；
g=图形。来自图像（mResult）；
g、 清除（颜色为红色）；//同时我找到了一个解决方案：

 private Image BlendImageWithWindowBackgoundColorToSize(Image pImage, float pColorOpacity)
    {
        Image mResult = null;
        if (pImage != null)
        {
            ColorMatrix matrix = new ColorMatrix(new float[][]{
            new float[] {1F, 0, 0, 0, 0},
            new float[] {0, 1F, 0, 0, 0},
            new float[] {0, 0, 1F, 0, 0},
            new float[] {0, 0, 0, pColorOpacity, 0}, //opacity in rage [0 1]
            new float[] {0, 0, 0, 0, 1F}});

            ImageAttributes imageAttributes = new ImageAttributes();
            imageAttributes.SetColorMatrix(matrix);
            imageAttributes.SetWrapMode(WrapMode.TileFlipXY);

            mResult = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);

            Image mImgSemiTransparent = (Image)mResult.Clone();
            Graphics g = Graphics.FromImage(mImgSemiTransparent);
            g.CompositingMode = CompositingMode.SourceOver; 
            g.CompositingQuality = CompositingQuality.HighQuality;           
            g.DrawImage(pImage, new Rectangle(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height), 0, 0, pImage.Width, pImage.Height, GraphicsUnit.Pixel, imageAttributes);

            Graphics gF = Graphics.FromImage(mResult);
            gF.Clear(Color.Red);
            gF.DrawImageUnscaled(mImgSemiTransparent, 0, 0, mImgSemiTransparent.Width, mImgSemiTransparent.Height);
        }

        return mResult;
    }

但γηράσκω′αεπολλδδδασκμε和几块柚木（这不完全是我想要的）的回答比我的快四倍：）

如果您只是在合并，那么为什么要使用
SetWrapMode
？使用
texture.WrapMode=WrapMode.Clamp；
进行简单合并而不重复图像。谢谢！
        private Image BlendImageWithWindowBackgoundColorToSize2(Image pImage, float pColorOpacity)
    {
        Image mResult = null;
        Image tempImage = null; //we will set the opacity of pImage to pColorOpacity and copy
                                //it to tempImage 
        if (pImage != null)
        {
            Graphics g;

            ColorMatrix matrix = new ColorMatrix(new float[][]{
            new float[] {1F, 0, 0, 0, 0},
            new float[] {0, 1F, 0, 0, 0},
            new float[] {0, 0, 1F, 0, 0},
            new float[] {0, 0, 0, pColorOpacity, 0}, //opacity in rage [0 1]
            new float[] {0, 0, 0, 0, 1F}});

            ImageAttributes imageAttributes = new ImageAttributes();
            imageAttributes.SetColorMatrix(matrix);
            imageAttributes.SetWrapMode(WrapMode.TileFlipXY);
            tempImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height, PixelFormat.Format32bppArgb);

            g = Graphics.FromImage(tempImage);
            //g.Clear(Color.Transparent); //No need!
            //setting pColorOpacity to pImage and drawing to tempImage 
            g.DrawImage(pImage, new Rectangle(0, 0, Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height), 0, 0, pImage.Width, pImage.Height, GraphicsUnit.Pixel, imageAttributes);

            g.Dispose();
            g = null;

            //now we will tile the tempImage
            TextureBrush texture = new TextureBrush(tempImage);

            mResult = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                                  Screen.PrimaryScreen.Bounds.Height,
                                  PixelFormat.Format32bppArgb);

            g = Graphics.FromImage(mResult);
            g.Clear(myColor);

            g.FillRectangle(texture, new Rectangle(0, 0, mResult.Width, mResult.Height));

            g.Dispose();
            g = null;

            tempImage.Dispose();
            tempImage = null;

        }

        return mResult;

    }