C#图像裁剪,分割,保存

Question

如主题所述,我有一个图像:

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

我想将它分成3 x 3矩阵,总共意味着9张图片并保存.有什么提示或技巧可以做到这一点吗？我正在使用视觉工作室2008并致力于智能设备.试过一些方法,但我无法得到它.这是我试过的:

        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;
        } 

Answer 1

根据.NET版本,您可以执行以下操作之一来裁剪:

.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

如您所见,它比您正在做的更简单.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,它支持从构造函数中直接获取图像的一部分.

拆分部分是简单的数学,只需将图像分成9组坐标并将它们传递给构造函数.