Crop a Bitmap Image

Android Crop Center of Bitmap

This can be achieved with: Bitmap.createBitmap(source, x, y, width, height)

if (srcBmp.getWidth() >= srcBmp.getHeight()){

  dstBmp = Bitmap.createBitmap(
     srcBmp, 
     srcBmp.getWidth()/2 - srcBmp.getHeight()/2,
     0,
     srcBmp.getHeight(), 
     srcBmp.getHeight()
     );

}else{

  dstBmp = Bitmap.createBitmap(
     srcBmp,
     0, 
     srcBmp.getHeight()/2 - srcBmp.getWidth()/2,
     srcBmp.getWidth(),
     srcBmp.getWidth() 
     );
}

How can I crop a bitmap for ImageView?

Alright, I will paste the comment as answer :) ->

RelativeLayout rl = (RelativeLayout) findViewById(R.id.rl1);

final Options bitmapOptions=new Options();
DisplayMetrics metrics = getResources().getDisplayMetrics();
bitmapOptions.inDensity = metrics.densityDpi;
bitmapOptions.inTargetDensity=1;

/*`final` modifier might be necessary for the Bitmap*/
Bitmap bmp= BitmapFactory.decodeResource(getResources(), R.drawable.ver_bottom_panel_tiled_long, bitmapOptions);
bmp.setDensity(Bitmap.DENSITY_NONE);
bmp = Bitmap.createBitmap(bmp, 0, 0, rl.getWidth(), bmp.getHeight());

Then in the code:

ImageView iv = (ImageView)v.findViewById(R.id.ver_bottompanelprayer);
if (iv != null){
  iv.setImageBitmap(bmp);
}

Cheers :)

Crop bottom portion of a bitmap programmatically

I am not familiar with operations on Bitmaps but from inspecting your code and looking at the API my guess would be that you need to specify the y coordinates on the following line to match the starting point:

Bitmap croppedBitmap = Bitmap.createBitmap(toBeCropped, 0, "here", toBeCropped.getWidth(), fromHere);

So my guess would be something like the following:

Bitmap croppedBitmap = Bitmap.createBitmap(toBeCropped, 0, (toBeCropped.getHeight() * 0.8), toBeCropped.getWidth(), fromHere);

in this case fromHere will define the number of rows you want to crop not the starting point (which is 20% of the total as you have pointed out)

Crop an Image in WPF

You can use CroppedBitmap for that

var fullBitmap = new BitmapImage(new Uri(@".."));
tileSet.Source = new CroppedBitmap(fullBitmap, new Int32Rect(0, 0, 100, 100));

Android Crop Center of Bitmap

This can be achieved with: Bitmap.createBitmap(source, x, y, width, height)

if (srcBmp.getWidth() >= srcBmp.getHeight()){

  dstBmp = Bitmap.createBitmap(
     srcBmp, 
     srcBmp.getWidth()/2 - srcBmp.getHeight()/2,
     0,
     srcBmp.getHeight(), 
     srcBmp.getHeight()
     );

}else{

  dstBmp = Bitmap.createBitmap(
     srcBmp,
     0, 
     srcBmp.getHeight()/2 - srcBmp.getWidth()/2,
     srcBmp.getWidth(),
     srcBmp.getWidth() 
     );
}

How do I crop an image using C#?

You can use [Graphics.DrawImage][1] to draw a cropped image onto the graphics object from a bitmap.

Rectangle cropRect = new Rectangle(...);
using (Bitmap src = Image.FromFile("") as Bitmap)
{
    using (Bitmap target = new Bitmap(cropRect.Width, cropRect.Height))
    {
        using (Graphics g = Graphics.FromImage(target))
        {
            g.DrawImage(src, new Rectangle(0, 0, target.Width, target.Height),
                cropRect,
                GraphicsUnit.Pixel);
        }
    }
}

Cropped Bitmap not fitting to the center. (Hand free cropping.)

I was searching a solution for a 2 days. I looked all cropping answers in StackOverflow and did'nt find any solution to make it center. And trimming extra spaces. So I found a solution for avoiding extra spaces on cropped image....

Using this function is making new Bitmap without extra spaces. Use function before resultingImage.

 static Bitmap trim(Bitmap source) {
        int firstX = 0, firstY = 0;
        int lastX = source.getWidth();
        int lastY = source.getHeight();
        int[] pixels = new int[source.getWidth() * source.getHeight()];
        source.getPixels(pixels, 0, source.getWidth(), 0, 0, source.getWidth(), source.getHeight());
        loop:
        for (int x = 0; x < source.getWidth(); x++) {
            for (int y = 0; y < source.getHeight(); y++) {
                if (pixels[x + (y * source.getWidth())] != Color.TRANSPARENT) {
                    firstX = x;
                    break loop;
                }
            }
        }
        loop:
        for (int y = 0; y < source.getHeight(); y++) {
            for (int x = firstX; x < source.getWidth(); x++) {
                if (pixels[x + (y * source.getWidth())] != Color.TRANSPARENT) {
                    firstY = y;
                    break loop;
                }
            }
        }
        loop:
        for (int x = source.getWidth() - 1; x >= firstX; x--) {
            for (int y = source.getHeight() - 1; y >= firstY; y--) {
                if (pixels[x + (y * source.getWidth())] != Color.TRANSPARENT) {
                    lastX = x;
                    break loop;
                }
            }
        }
        loop:
        for (int y = source.getHeight() - 1; y >= firstY; y--) {
            for (int x = source.getWidth() - 1; x >= firstX; x--) {
                if (pixels[x + (y * source.getWidth())] != Color.TRANSPARENT) {
                    lastY = y;
                    break loop;
                }
            }
        }
        return Bitmap.createBitmap(source, firstX, firstY, lastX - firstX, lastY - firstY);
    }

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