[Silverlight]使用WritableBitmap将图片处理成为黑白图片

最新推荐文章于 2025-01-21 09:36:24 发布

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最新推荐文章于 2025-01-21 09:36:24 发布

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文章标签： c#

原文链接：http://www.cnblogs.com/lonelyxmas/archive/2011/09/03/2165534.html

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[Silverlight]使用WritableBitmap将图片处理成为黑白图片

原文

http://www.dotblogs.com.tw/junegoat/archive/2010/10/02/silverlight-black-and-white.aspx

之前遇到我们家设计一个小要求... 他需要一个转把图片转黑白的特效...

在Silverlight 中要如何做到呢?!

下面是小范例... 先介绍一下配置..

点击按钮后可以将imgSource 的图案转成黑白后放入imgTarget中..

XAML Code:

 
        < UserControl x:Class ="WritableBitmapBnW.MainPage"  
           xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
           xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml"  
           xmlns:d ="http://schemas.microsoft.com/expression/blend/2008"  
           xmlns:mc ="http://schemas.openxmlformats.org/markup-compatibility/2006"  
           mc:Ignorable ="d"  
           d:DesignHeight ="200" d:DesignWidth ="500" >  
           < 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 ="bzspark.png" />  
               < Button Content ="转黑白图" Height ="28" HorizontalAlignment ="Left" Margin ="217,113,0,0" Name ="btnConvertBnW" VerticalAlignment ="Top" Width ="76" FontSize ="14" FontFamily = "微软正黑体" Click ="btnConvertBnW_Click" />  
               < Image Height ="65" HorizontalAlignment ="Left" Margin ="307,76,0,0" Name ="imgTarget" Stretch ="Fill" VerticalAlignment ="Top" Width ="137" />  
           </ Grid >  
        </ UserControl >  
     

来看一下C# 这边的Code..

 
        private void btnConvertBnW_Click( object sender, RoutedEventArgs e)  
       {  
                   //读入欲转换的图片并转成为WritableBitmap  
                   WriteableBitmap bitmap = new WriteableBitmap( this .imgSource, null );  
                   for ( int y = 0; y < bitmap.PixelHeight; y++)  
                   {  
                       for ( int x = 0; x < bitmap.PixelWidth; x++)  
                       {  
                           //取得每一个pixel  
                           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  
                           //位置3是alpha  
                           //排列真是诡异阿..><刚好反过来s  
                           //将处理后的pixel置回  
                           bitmap.Pixels[pixelLocation] = BitConverter.ToInt32(pixBytes, 0);  
                       }  
                   }  
                   //显示结果  
                   this .imgTarget.Source = bitmap;  
       }  
     