C#在运行时调整图像大小

Question

如果图像大小超过1024x768，我想调整图像的大小，然后保存新实例而不是原始实例，但这段代码正在保存原始实例。我该怎么修？

private static void ResizeImage(int newWidth, int newHeight, Stream OriginalImage, string targetPath)
{
using (var image = System.Drawing.Image.FromStream(OriginalImage))
{
var thumbnailImg = new Bitmap(newWidth, newHeight);
var thumbGraph = Graphics.FromImage(thumbnailImg);
thumbGraph.CompositingQuality = CompositingQuality.HighQuality;
thumbGraph.SmoothingMode = SmoothingMode.HighQuality;
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic;
var imageRectangle = new Rectangle(0, 0, newWidth, newHeight);
thumbGraph.DrawImage(image, imageRectangle);
thumbnailImg.Save(targetPath, image.RawFormat);
}
}

Answer 1

我假设"拇指指甲Img"；被认为是缩小的版本的"；图像"；。

如果是这样，请使用专门为此目的设计的位图构造函数：

Bitmap(Image, Int32, Int32)

例如：

var thumbnail = new Bitmap(image, newWidth, newHeight);