在C＃中使用imagemagick.net图像应用水印 [英] Apply watermark on image using imagemagick.net in c#

问题描述

我使用下面的代码来调整图像大小。现在，我需要将此图像使用 Magick.NET 上的水印。

  VAR响应= client.GetObject（要求）.ResponseStream; 
 MagickImage形象=新MagickImage（响应）; 
 MagickGeometry大小=新MagickGeometry（imgWidth，imgHeight）; 
 size.IgnoreAspectRatio = maintainAspectRatio; 
 image.Resize（大小）; 
 
 
位图watermarkObj =（位图）Bitmap.FromFile（G：/Images/watermark.png）; 
图形imageGraphics = Graphics.FromImage（image.ToBitmap（））; 
点积分=新的点（image.Width  -  118，image.Height  -  29）; 
 imageGraphics.DrawImage（watermarkObj，点）; 
 image.write（G：/Images/ProcessedImage.JPG）; 
  

工作代码：

  MagickGeometry大小=新MagickGeometry（imgWidth，imgHeight）; 
 size.IgnoreAspectRatio = maintainAspectRatio; 
 image.Resize（大小）; 
 
 
位图watermarkObj =（位图）Bitmap.FromFile（G：/Images/watermark.png）; 
位图objImg =新位图（G：/Images/OriginalImage.jpg）; 
图形imageGraphics = Graphics.FromImage（objImg）; 
点积分=新的点（image.Width  -  118，image.Height  -  29）; 
 imageGraphics.DrawImage（watermarkObj，点）; 
 objImg.save（G：/Images/ProcessedImage.JPG）; 
  

因此​​，谁能帮助我如何与使用ImageMagick做呢？原因是当我在图形传递imageObject它并不适用在哪里，当我通过.NET图像对象将其应用于水印的水印。

解决方案

您的代码不工作，因为 image.ToBitmap（）创建一个新的位图。当你调用 image.write（G：/Images/ProcessedImage.JPG）; 要保存的图像的未修改版本实例。你应该做的，而不是下面。

<预类=郎-CS prettyprint-覆盖> 使用（MagickImage形象=新MagickImage（响应））
{
MagickGeometry大小=新MagickGeometry（imgWidth，imgHeight）;
size.IgnoreAspectRatiomaintainAspectRatio;
image.Resize（大小）; （（位图imageObj = image.ToBitmap））
{使用
：

使用（位图watermarkObj =位图）Bitmap.FromFile（/Images/watermark.png G） ）
{使用
（图形imageGraphics = Graphics.FromImage（imageObj））
{
指向点=新的点（image.Width - 118，image.Height - 29）;
imageGraphics.DrawImage（watermarkObj，点）;
imageObj.Save（G：/Images/ProcessedImage.JPG）;
}
}
}
}


另外请注意，我添加了使用语句。你真的应该用这个当你与的IDisposable 类的工作。

您也可以做到这一点，而无需使用 System.Drawing中。我已经Magick.NET为这个文档中创建了一个新的例子：的https：/ /magick.codeplex.com/wikipage?title=Watermark&ref​​erringTitle=Documentation

您可以在您的情况使用下面的代码：

<预类=郎-CS prettyprint-覆盖> 使用（MagickImage形象=新MagickImage（响应））
{
MagickGeometry大小=新MagickGeometry（imgWidth，imgHeight）;
size.IgnoreAspectRatiomaintainAspectRatio;
image.Resize（大小）; 118，图像 -
{
image.Composite（水印，image.Width：使用（/Images/watermark.png G）MagickImage水印=新MagickImage（）

.Height - 29日，CompositeOperator.Over）;
image.Write（G：/Images/ProcessedImage.JPG）;
}
}


I am using the following code to resize the image. Now, i need to apply the watermark on this image using Magick.NET.

        var response = client.GetObject(request).ResponseStream;
        MagickImage image = new MagickImage(response);
        MagickGeometry size = new MagickGeometry(imgWidth, imgHeight);
        size.IgnoreAspectRatio = maintainAspectRatio;                                                       
        image.Resize(size);   


        Bitmap watermarkObj = (Bitmap)Bitmap.FromFile("G:/Images/watermark.png");
        Graphics imageGraphics = Graphics.FromImage(image.ToBitmap());
        Point point = new Point(image.Width - 118, image.Height - 29);                            
        imageGraphics.DrawImage(watermarkObj, point); 
        image.write("G:/Images/ProcessedImage.JPG");

Working Code :

            MagickGeometry size = new MagickGeometry(imgWidth, imgHeight);
            size.IgnoreAspectRatio = maintainAspectRatio;                                                       
            image.Resize(size);   


            Bitmap watermarkObj = (Bitmap)Bitmap.FromFile("G:/Images/watermark.png");
            Bitmap objImg = new Bitmap("G:/Images/OriginalImage.jpg");
            Graphics imageGraphics = Graphics.FromImage(objImg);
            Point point = new Point(image.Width - 118, image.Height - 29);                            
            imageGraphics.DrawImage(watermarkObj, point); 
            objImg.save("G:/Images/ProcessedImage.JPG");

So, Can anyone help me how to do it with using imagemagick? Reason being when i pass imageObject in graphics it doesn't apply the watermark where as when i pass the .net image object it apply the watermark.

解决方案

Your code is not working because image.ToBitmap() creates a new Bitmap. When you call image.write("G:/Images/ProcessedImage.JPG"); you are saving an unmodified version of the image instance. You should do the following instead.

using (MagickImage image = new MagickImage(response))
{
  MagickGeometry size = new MagickGeometry(imgWidth, imgHeight);
  size.IgnoreAspectRatiomaintainAspectRatio;                                   
  image.Resize(size);

  using (Bitmap watermarkObj = Bitmap)Bitmap.FromFile("G:/Images/watermark.png"))
  {
    using (Bitmap imageObj = image.ToBitmap())
    {
      using (Graphics imageGraphics = Graphics.FromImage(imageObj))
      {
        Point point = new Point(image.Width - 118, image.Height - 29);
        imageGraphics.DrawImage(watermarkObj, point);
        imageObj.Save("G:/Images/ProcessedImage.JPG");
      }
    }
  }
}

Also notice that I added the using statements. You should really use this when you are working with IDisposable classes.

You can also do this without using System.Drawing. I have created a new example in the documentation of Magick.NET for this: https://magick.codeplex.com/wikipage?title=Watermark&referringTitle=Documentation

You can use the following code in your situation:

using (MagickImage image = new MagickImage(response))
{
  MagickGeometry size = new MagickGeometry(imgWidth, imgHeight);
  size.IgnoreAspectRatiomaintainAspectRatio;                                   
  image.Resize(size);

  using (MagickImage watermark = new MagickImage("G:/Images/watermark.png"))
  {
    image.Composite(watermark, image.Width - 118, image.Height - 29, CompositeOperator.Over);
    image.Write("G:/Images/ProcessedImage.JPG");
  }
}

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