c# - 调整位图图像大小

Question

我想在保存图片时缩小尺寸。 我怎样才能调整它的大小？ 我使用此代码来重新生成图像:

Size size = new Size(surface.Width, surface.Height);
surface.Measure(size);
surface.Arrange(new Rect(size));
// Create a render bitmap and push the surface to it
RenderTargetBitmap renderBitmap =
    new RenderTargetBitmap(
        (int)size.Width,
        (int)size.Height, 96d, 96d,
        PixelFormats.Default);
renderBitmap.Render(surface);

BmpBitmapEncoder encoder = new BmpBitmapEncoder();
// push the rendered bitmap to it
encoder.Frames.Add(BitmapFrame.Create(renderBitmap));
// save the data to the stream
encoder.Save(outStream);

Answer 1

public static Bitmap ResizeImage(Bitmap imgToResize, Size size)
{
    try
    {
        Bitmap b = new Bitmap(size.Width, size.Height);
        using (Graphics g = Graphics.FromImage((Image)b))
        {
            g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            g.DrawImage(imgToResize, 0, 0, size.Width, size.Height);
        }
        return b;
    }
    catch 
    { 
        Console.WriteLine("Bitmap could not be resized");
        return imgToResize; 
    }
}