即使在 RenderOptions.SetBitmapScalingMode 为 HighQuality 之后，我的图像质量也很低

Question

即使在 RenderOptions.SetBitmapScalingMode(thumbImg, BitmapScalingMode.HighQuality); 之后，我的图像质量也很低。 任何想法

        if(File.Exists(image_file.FullName))
        {
            IPLRes.print( "Loading " + image_file.FullName);
            BitmapImage thumbImg = new BitmapImage(new Uri(image_file.FullName));
            RenderOptions.SetBitmapScalingMode(thumbImg, BitmapScalingMode.HighQuality);
            ImageBrush imgbrush = new ImageBrush(thumbImg);
            imgbrush.Stretch = System.Windows.Media.Stretch.Uniform;
            RenderedPages[page_numx] = imgbrush;

        }

......

ShapRectangle thumbnail = (ShapRectangle)FindName("rect_Thumb" + thumbnail_nbr);
VISUAL thumbnailvisual = (VISUAL)FindName("rect_Thumb" + thumbnail_nbr);
thumbnail.Fill = (System.Windows.Media.Brush)RenderedPages[page_numx];

Answer 1

我通过在主窗口中添加 RenderOptions.SetBitmapScalingMode 最终使其工作。感谢 stefanOlson http://www.olsonsoft.com/blogs/stefanolson/post/Workaround-for-low-quality-bitmap-resizing-in-WPF-4.aspx

MainWindow()
 { 
  InitializeComponent();
  RenderOptions.SetBitmapScalingMode(this, BitmapScalingMode.Fant);
    ...........
 }