How to crop the bitmap and save it in its original quality?

Hello Riddhi,

Please refer below link:

https://learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-set-jpeg-compression-level?view=netframeworkdesktop-4.8

Thanks

Naimish Makwana

You can use LEADTOOLS Imaging Pro SDK technology in your application.

https://www.leadtools.com/sdk/products/imaging-pro

You can leverage the CropCommand class, which will allow you to take the points you have and crop your image. When you use the CropCommand, the quality(DPI) of the image will not change. See the sample code below:

string srcFileName = @"FILE PATH TO INPUT IMAGE"; 
string destFileName = @"FILE PATH TO OUTPUT CROPPED IMAGE";

using (RasterCodecs _codecs = new RasterCodecs())
using (RasterImage _image = _codecs.Load(srcFileName))
{
    CropCommand _cmd = new CropCommand(); 
	_cmd.Rectangle = new LeadRect( 0, 0, 99, 592);
	_cmd.Run(image);

    _codecs.Save(_image, destFileName, RasterImageFormat.Bmp, 0);
}

Hi Ridhdhi,

Based on your peoblem statement, use the below steps:-

1. Load the original bitmap into a Bitmap object.
2. Create a new Rectangle object that specifies the area of the bitmap you want to crop. This rectangle should have a height of 592 and width of 699.
3. Create a new Bitmap object that is the same size as the rectangle you just created.
4. Use the Graphics.FromImage method to create a Graphics object that you can use to draw the cropped image onto the new Bitmap object.
5. Use the DrawImage method of the Graphics object to draw the cropped image onto the new Bitmap object.
6. Save the new Bitmap object to a file using the Save method.

try to use below code to solve your problem:

// Load the original bitmap
Bitmap original = new Bitmap("original.bmp");

// Create a rectangle representing the area to be cropped
Rectangle cropRect = new Rectangle(0, 0, 699, 592);

// Create a new bitmap the same size as the crop rectangle
Bitmap cropped = new Bitmap(cropRect.Width, cropRect.Height);

// Create a graphics object to draw the cropped image
using (Graphics g = Graphics.FromImage(cropped))
{
    // Draw the cropped image
    g.DrawImage(original, new Rectangle(0, 0, cropped.Width, cropped.Height), 
                cropRect, GraphicsUnit.Pixel);
}

// Save the cropped image to a file
cropped.Save("cropped.bmp", ImageFormat.Bmp);

It will load the original bitmap then create a new bitmap that is the same size as the crop rectangle then draw the cropped image onto the new bitmap and then save the new bitmap to a file. The resulting image will be the same quality as the original because it is simply a copy of a portion of the original image.

Thanks

Hi Ridhdi vaghani 

check this URL- https://www.codeproject.com/Questions/5349954/How-to-crop-bitmap-and-save-with-original-clarity