高质量图像缩放 [英] High quality image scaling

问题描述

我已经阅读了以下问题，高质量图像缩放库，但是它仅适用于GDI +.

I have read this question, High Quality Image Scaling Library , but it only pertains to GDI+.

当我在应用程序中按比例缩小Image时，它变得非常锯齿.

When I scale down an Image in my app, it becomes very jaggy.

在Image类上找不到任何可以提高降级质量的属性.

I can't find any property on the Image class that allows me to increase the quality of the down-scaling.

我该怎么做?

我现在使用了以下代码:

I have now used this code:

BitmapImage img = new BitmapImage();
img.UriSource = new Uri(Graphic, UriKind.Relative);
return img;

其中Graphic是string，其中包含图像的路径，但出现此异常:

where Graphic is a string that contains the path to the image, but am getting this exception:

Weather.DLL中发生了'System.ArgumentException'类型的异常，但未在用户代码中处理

An exception of type 'System.ArgumentException' occurred in Weather.DLL but was not handled in user code

其他信息:无法将给定的System.Uri转换为Windows.Foundation.Uri.请参阅> http://go.microsoft.com/fwlink/?LinkID=215849 了解详情.

Additional information: The given System.Uri cannot be converted into a Windows.Foundation.Uri. Please see http://go.microsoft.com/fwlink/?LinkID=215849 for details.

据我所知，.net框架中未使用Windows.Foundation.Uri.

As far as I know, Windows.Foundation.Uri isn't used in the .net framework.

那为什么会给我这个错误?

So why is it giving me this error?

推荐答案

在XAML中:

    <Image Width="250" Height="250" Stretch="UniformToFill">
        <Image.Source>
           <BitmapImage UriSource="{Binding ImagePath}" DecodePixelHeight="250"/>
        </Image.Source>
    </Image>

在C#中:

    BitmapImage bitmapImage = BitmapImage("URL HERE");
    bitmapImage.DecodePixelHeight = 250;

仅设置DecodePixelHeight或DecodePixelWidth.

Only set DecodePixelHeight or DecodePixelWidth.

http://msdn. microsoft.com/en-us/library/system.windows.media.imaging.bitmapimage.decodepixelheight.aspx

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