[英]C# crop an image at small top portion
我有一个图像,我想裁剪图像的顶部并将图像保存在C#中。 我该怎么办?
以下是一些有据可查的裁剪代码 :
try
{
//create the destination (cropped) bitmap
Bitmap bmpCropped = new Bitmap(100, 100);
//create the graphics object to draw with
Graphics g = Graphics.FromImage(bmpCropped);
Rectangle rectDestination = new Rectangle(0, 0, bmpCropped.Width, bmpCropped.Height);
Rectangle rectCropArea = new Rectangle(myX, myY, myCropWidth, myCropHeight);
//draw the rectCropArea of the original image to the rectDestination of bmpCropped
g.DrawImage(myOriginalImage, rectDestination, rectCropArea,GraphicsUnit.Pixel);
//release system resources
}
finally
{
g.Dispose();
}
您可以创建一个所需大小的新位图,然后使用Graphics.FromImage将旧图像的一部分绘制到新图像上,以创建一个可绘制到新图像中的Graphics对象。 完成后,请确保处置Graphics对象,然后可以保存新创建的图像。
public static Bitmap Crop(Bitmap bitmap, Rectangle rect)
{
// create new bitmap with desired size and same pixel format
Bitmap croppedBitmap = new Bitmap(rect.Width, rect.Height, bitmap.PixelFormat);
// create Graphics "wrapper" to draw into our new bitmap
// "using" guarantees a call to gfx.Dispose()
using (Graphics gfx = Graphics.FromImage(croppedBitmap))
{
// draw the wanted part of the original bitmap into the new bitmap
gfx.DrawImage(bitmap, 0, 0, rect, GraphicsUnit.Pixel);
}
return croppedBitmap;
}
其他答案将起作用,这是通过为Image
创建扩展方法来实现的方法 :
class TestProgram
{
static void Main()
{
using (Image testImage = Image.FromFile(@"c:\file.bmp"))
using (Image cropped =
testImage.Crop(new Rectangle(10, 10, 100, 100)))
{
cropped.Save(@"c:\cropped.bmp");
}
}
}
static public class ImageExtensions
{
static public Bitmap Crop(this Image originalImage, Rectangle cropBounds)
{
Bitmap croppedImage =
new Bitmap(cropBounds.Width, cropBounds.Height);
using (Graphics g = Graphics.FromImage(croppedImage))
{
g.DrawImage(originalImage,
0, 0,
cropBounds,
GraphicsUnit.Pixel);
}
return croppedImage;
}
}
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