.net平台使用ImageMagick进行图片读取、缩放、压缩 、保存等

• 第三方类库：Magick.NET-Q8-AnyCPU.dll、Magick.NET.Core.dll DLL下载

using ImageMagick;

{//指定路径图片缩略图显示
	MagickImage img = new MagickImage(filePath);
	img.Scale(this.imageList1.ImageSize.Width, imageList1.ImageSize.Height);//按宽高取图
	Stream st = new MemoryStream();
	img.Write(st);//输出到内存
	Image img2 = new Bitmap(st); 
	imageList1.Images.Add(img2);
}

{//pictureBox1图片读到内存 → 通过MagickImage输出到本地
	MemoryStream mstr = new MemoryStream(); //创建新的MemoryStream
	pictureBox1.Image.Save(mstr, ImageFormat.Jpeg);// 保存对象到内存
	MagickImage image = new MagickImage(mstr.ToArray(), MagickFormat.Jpeg);
	var arr = txtImgSize.Text.Trim().Replace(",", " ").Replace("，", " ").Split(' ');
	image.Scale(int.Parse(arr[0]), int.Parse(arr[1]));//缩放
	MemoryStream mstr2 = new MemoryStream(); //创建新的MemoryStream
	image.Write(mstr2);
	image.Dispose();
}			
			  
{//无损压缩 
MagickImage image = new MagickImage(filePath);
    image.Quality = 100;//无损压缩  
    Percentage percentage = new Percentage(50);
    image.Resize(percentage);//调大小 按px值
    //image.Scale(width, height);//缩放 字不清楚较严重
    image.Write(FilePath);//输出到磁盘
	image.Dispose();
}