C# 图像裁剪、分割、保存

发布于 2024-09-02 20:56:09 字数 836 浏览 4 评论 0原文

如主题中所述，我有一个图像：

    private Image testing;
    testing = new Bitmap(@"sampleimg.jpg");

我想将其分成 3 x 3 矩阵，即总共 9 个图像并保存它。有什么技巧或技巧可以做到这一点吗？我正在使用 Visual Studio 2008 并在智能设备上工作。尝试了一些方法，但我无法得到它。这是我尝试过的：

        int x = 0;
        int y = 0;
        int width = 3;
        int height = 3;


        int count = testing.Width / width;
        Bitmap bmp = new Bitmap(width, height);


        Graphics g = Graphics.FromImage(bmp);


        for (int i = 0; i < count; i++)
        {
            g.Clear(Color.Transparent);
            g.DrawImage(testing, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
            bmp.Save(Path.ChangeExtension(@"C\AndrewPictures\", String.Format(".{0}.bmp",i)));
            x += width;
        }

原文

as stated in subject, i have an image:

    private Image testing;
    testing = new Bitmap(@"sampleimg.jpg");

I would like to split it into 3 x 3 matrix meaning 9 images in total and save it.Any tips or tricks to do this simple? I'm using visual studios 2008 and working on smart devices. Tried some ways but i can't get it. This is what i tried:

        int x = 0;
        int y = 0;
        int width = 3;
        int height = 3;


        int count = testing.Width / width;
        Bitmap bmp = new Bitmap(width, height);


        Graphics g = Graphics.FromImage(bmp);


        for (int i = 0; i < count; i++)
        {
            g.Clear(Color.Transparent);
            g.DrawImage(testing, new Rectangle(0, 0, width, height), new Rectangle(x, y, width, height), GraphicsUnit.Pixel);
            bmp.Save(Path.ChangeExtension(@"C\AndrewPictures\", String.Format(".{0}.bmp",i)));
            x += width;
        }

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分開簡單 2024-09-09 20:56:09

根据 .NET 版本，您可以执行以下操作之一进行裁剪：

.NET 2.0

private static Image cropImage(Image img, Rectangle cropArea)
{
   Bitmap bmpImage = new Bitmap(img);
   Bitmap bmpCrop = bmpImage.Clone(cropArea,
   bmpImage.PixelFormat);
   return (Image)(bmpCrop);
}

或 .NET 3.5+

// Create an Image element.
Image croppedImage = new Image();
croppedImage.Width = 200;
croppedImage.Margin = new Thickness(5);

// Create a CroppedBitmap based off of a xaml defined resource.
CroppedBitmap cb = new CroppedBitmap(     
   (BitmapSource)this.Resources["masterImage"],
   new Int32Rect(30, 20, 105, 50));       //select region rect
croppedImage.Source = cb;                 //set image source to cropped

正如您所看到的，它比您正在做的要简单一些。第一个示例克隆当前图像并获取其子集；第二个示例使用 CroppedBitmap，它支持直接从构造函数获取图像的一部分。

分割部分是简单的数学运算，只需将图像分割成 9 组坐标并将它们传递给构造函数即可。

Depending on the .NET version, you could do one of the following to crop:

.NET 2.0

private static Image cropImage(Image img, Rectangle cropArea)
{
   Bitmap bmpImage = new Bitmap(img);
   Bitmap bmpCrop = bmpImage.Clone(cropArea,
   bmpImage.PixelFormat);
   return (Image)(bmpCrop);
}

Or .NET 3.5+

// Create an Image element.
Image croppedImage = new Image();
croppedImage.Width = 200;
croppedImage.Margin = new Thickness(5);

// Create a CroppedBitmap based off of a xaml defined resource.
CroppedBitmap cb = new CroppedBitmap(     
   (BitmapSource)this.Resources["masterImage"],
   new Int32Rect(30, 20, 105, 50));       //select region rect
croppedImage.Source = cb;                 //set image source to cropped

As you can see, it's a bit more simple than what you're doing. The first example clones the current image and takes a subset of it; the second example uses CroppedBitmap, which supports taking a section of the image right from the constructor.

The splitting part is simple maths, just splitting the image into 9 sets of coordinates and passing them into the constructor.

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