How to Crop Images in C# Using Image.Crop() and Bitmap.Clone()?

C# image cropping method

Picture cropping is a common task in image processing, used to remove unwanted parts of a picture, highlight specific areas, or improve the composition of the picture. This article introduces two efficient C# image cropping methods:

Use Image.Crop() method:

Question: How to crop an image using the Image.Crop() method in C#?

Answer:

The Image.Crop() method needs to specify the rectangular area to be cropped. An example is as follows:

Image img = Image.FromFile("image.jpg");
Rectangle cropArea = new Rectangle(100, 100, 200, 200);
Image croppedImage = img.Clone() as Image;
croppedImage.Crop(cropArea);
croppedImage.Save("cropped-image.jpg");

Use Bitmap.Clone() method:

Question: Can I use Bitmap.Clone() method instead of Image.Crop() method to crop an image?

Answer:

Yes. The Bitmap.Clone() method creates a new image based on the specified rectangle. This method is slightly faster than the Image.Crop() method when working with bitmaps:

Bitmap bmpImage = new Bitmap(img);
Rectangle cropArea = new Rectangle(100, 100, 200, 200);
Image croppedImage = bmpImage.Clone(cropArea, bmpImage.PixelFormat);
croppedImage.Save("cropped-image.jpg");

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