将彩色图片变灰色？

ljjwf 2010-12-04 10:41:48

silverlight中点击一个按钮将彩色图片变灰色后台代码咋写啊

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tinalovetina 2012-10-19

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WriteableBitmap bitmap = new WriteableBitmap(this.imgSource, null);
for (int y = 0; y < bitmap.PixelHeight; y++)
用到项目中，其中bitmap.PixelHeight=0，为什么？

lcp147572931 2010-12-06

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[Quote=引用楼主 ljjwf 的回复:]
silverlight中点击一个按钮将彩色图片变灰色后台代码咋写啊
[/Quote]



        <Grid x:Name="LayoutRoot" Background="White">

        <Image Height="65" HorizontalAlignment="Left" Margin="69,76,0,0" Name="imgSource" Stretch="Fill" VerticalAlignment="Top" Width="137" Source="test.jpg" />

            <Button Content="转为黑白" Height="28" HorizontalAlignment="Left" Margin="217,113,0,0" Name="btnConvertBnW" VerticalAlignment="Top" Width="76" FontSize="14" Click="btnConvertBnW_Click" />

            <Image Height="65" HorizontalAlignment="Left" Margin="307,76,0,0" Name="imgTarget" Stretch="Fill" VerticalAlignment="Top" Width="137" />

        </Grid>



        private void btnConvertBnW_Click(object sender, RoutedEventArgs e)

        {

            //读取想转换的图片并转为WritableBitmap

            WriteableBitmap bitmap = new WriteableBitmap(this.imgSource, null);

            for (int y = 0; y < bitmap.PixelHeight; y++)

            {

                for (int x = 0; x < bitmap.PixelWidth; x++)

                {

                    //获取每一个像素                  

                    int pixelLocation = bitmap.PixelWidth * y + x;

                    int pixel = bitmap.Pixels[pixelLocation];

                    byte[] pixBytes = BitConverter.GetBytes(pixel);

                    //每一个都除3                  

                    byte bnwPixel = (byte)(.333 * pixBytes[2] + .333 * pixBytes[1] + .333 * pixBytes[0]);

                    pixBytes[0] = bnwPixel;//b                   

                    pixBytes[1] = bnwPixel;//g                    

                    pixBytes[2] = bnwPixel;//r                                    

                    //将处理后的像素返回                   

                    bitmap.Pixels[pixelLocation] = BitConverter.ToInt32(pixBytes, 0);

                }

            }            

            //显示结果           

            this.imgTarget.Source = bitmap;

        }