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WPF 图片灰度处理

2011-12-12 16:46 274 查看
文章的内容是来自微软中文技术论坛的一个帖子,当时是想将一段将图片灰度处理的代码转换为XAML的一个样式,在这里要谢谢


XiaoYanQiang、Sheldon_Xiao、shixin的热情回答,现在将他们的回答贴出来供大家学习参考.内容如下:

提问:这个功能如何写成一个样式,将一个窗体内所有的Image控件的图片格式都转换为Gray8

BitmapImagebitmapImage=newBitmapImage(newUri("D:\\Face.jpg"));

FormatConvertedBitmapnewFormatedBitmapSource=newFormatConvertedBitmap();
newFormatedBitmapSource.BeginInit();
newFormatedBitmapSource.Source=bitmapImage;
newFormatedBitmapSource.DestinationFormat=PixelFormats.Gray8;
newFormatedBitmapSource.EndInit();

img.Source=newFormatedBitmapSource;
this.Content=img;

XiaoYanQiang的回答:

publicclassImageAttached
{
//Gray8附加属性，Gary8图片样式的"开关"

publicstaticreadonlyDependencyPropertyGray8Property=
DependencyProperty.RegisterAttached("Gray8",typeof(bool),typeof(ImageAttached),
newFrameworkPropertyMetadata((bool)false,
newPropertyChangedCallback(OnGray8Changed)));

publicstaticboolGetGray8(DependencyObjectd)
{
return(bool)d.GetValue(Gray8Property);
}

publicstaticvoidSetGray8(DependencyObjectd,boolvalue)
{
d.SetValue(Gray8Property,value);
}

privatestaticvoidOnGray8Changed(DependencyObjectd,DependencyPropertyChangedEventArgse)
{
ImagecurrentImage=dasImage;
if(currentImage==null)
{
return;
}

boolisGray8=(bool)d.GetValue(Gray8Property);

if(isGray8)
{
//附加BitmapSourceBackup属性，备份当前BitmapSource，以备恢复用

BitmapSourcebackupBitmapSource=(currentImage.SourceasBitmapSource).CloneCurrentValue();
d.SetValue(BitmapSourceBackupProperty,backupBitmapSource);

//建立Gray8的BitmapSource

FormatConvertedBitmapnewFormatedBitmapSource=newFormatConvertedBitmap();
newFormatedBitmapSource.BeginInit();
newFormatedBitmapSource.Source=currentImage.SourceasBitmapSource;
newFormatedBitmapSource.DestinationFormat=PixelFormats.Gray8;
newFormatedBitmapSource.EndInit();

//替换ImageSource

currentImage.Source=newFormatedBitmapSource;
}
else
{
//图像恢复操作

objectobj=currentImage.GetValue(BitmapSourceBackupProperty);
if(obj==null)
{
return;
}

BitmapSourcebs=objasBitmapSource;
if(bs==null)
{
return;
}

currentImage.Source=bs;
}
}

//备份用源图像的附加属性，当Gray8变更时，自动附加

publicstaticreadonlyDependencyPropertyBitmapSourceBackupProperty=
DependencyProperty.RegisterAttached("BitmapSourceBackup",typeof(BitmapSource),typeof(ImageAttached),
newFrameworkPropertyMetadata(null));

publicstaticBitmapSourceGetBitmapSourceBackup(DependencyObjectd)
{
return(BitmapSource)d.GetValue(BitmapSourceBackupProperty);
}

publicstaticvoidSetBitmapSourceBackup(DependencyObjectd,BitmapSourcevalue)
{
d.SetValue(BitmapSourceBackupProperty,value);
}
}

然后XAML里添加local:ImageAttached.Gray8="True"


<Imagexmlns:local="clr-namespace:WpfImageGray8Sample"Source="/WpfImageGray8Sample;component/Images/44537119.jpg"local:ImageAttached.Gray8="True"/>


这样就可以方便控制Gray8了。




Sheldon_Xiao

的回答:


推荐了一个链接:http://www.rikware.com/post/Setting-FormatConvertedBitmap-Source-via-Binding.aspx


里面也是用转换器实现




shixin的回答:

<Windowx:Class="MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:y="clr-namespace:WpfApplication1"Title="MainWindow"Height="350"Width="525">

<Window.Resources>

<y:GrayImagex:Key="GrayImage"/>

</Window.Resources>

<Grid>

<ImageSource="{BindingRelativeSource={RelativeSourceSelf},Path=Tag,Converter={StaticResourceGrayImage}}"Tag="C:\Test.jpg"/>

</Grid>

</Window>

xaml部分还可以写成这样

<Window.Resources>

<y:GrayImagex:Key="GrayImage"/>

<StyleTargetType="{x:TypeImage}">

<SetterProperty="Source"Value="{BindingRelativeSource={RelativeSourceSelf},Path=Tag,Converter={StaticResourceGrayImage}}"/>

</Style>

</Window.Resources>

<Grid>

<ImageTag="C:\Test.jpg"/>

</Grid>

PublicClassGrayImage
ImplementsIValueConverter
PublicFunctionConvert(ByValvalueAsObject,ByValtargetTypeAsType,ByValparameterAsObject,ByValcultureAsGlobalization.CultureInfo)AsObjectImplementsIValueConverter.Convert
Try
DimnewFormatedBitmapSourceAsNewFormatConvertedBitmap
newFormatedBitmapSource.BeginInit()
newFormatedBitmapSource.Source=NewBitmapImage(NewUri(value.ToString))
newFormatedBitmapSource.DestinationFormat=PixelFormats.Gray8
newFormatedBitmapSource.EndInit()
Convert=newFormatedBitmapSource
Catch
Convert=Nothing
EndTry
EndFunction
PublicFunctionConvertBack(ByValvalueAsObject,ByValtargetTypeAsType,ByValparameterAsObject,ByValcultureAsGlobalization.CultureInfo)AsObjectImplementsIValueConverter.ConvertBack
ConvertBack=value
EndFunction
EndClass


再次的谢谢他们…
                                            

                                        

                        
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